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What is a one-way repeated measures ANOVA?
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Repeated Measures (ANOVA)
Conceptual Explanation
How did you get here?
How did you get here?So, you have decided to use a Repeated Measures ANOVA.
How did you get here?So, you have decided to use a Repeated Measures ANOVA.Let’s consider the decisions you made to get here.
First of all, you must have noticed the problem to be solved deals with generalizing from a smaller sample to a larger population.
First of all, you must have noticed the problem to be solved deals with generalizing from a smaller sample to a larger population.
First of all, you must have noticed the problem to be solved deals with generalizing from a smaller sample to a larger population.
Sample of 30
First of all, you must have noticed the problem to be solved deals with generalizing from a smaller sample to a larger population.
Sample of 30
Generalizes to
First of all, you must have noticed the problem to be solved deals with generalizing from a smaller sample to a larger population.
Large Population of 30,000
Sample of 30
Generalizes to
First of all, you must have noticed the problem to be solved deals with generalizing from a smaller sample to a larger population.
Therefore, you would determine that the problem deals with inferential not descriptive statistics.
Large Population of 30,000
Sample of 30
Generalizes to
Therefore, you would determine that the problem deals with inferential not descriptive statistics.
Therefore, you would determine that the problem deals with inferential not descriptive statistics.
Double check your problem to see if that is the case
Therefore, you would determine that the problem deals with inferential not descriptive statistics.
Inferential Descriptive
Double check your problem to see if that is the case
You would have also noticed that the problem dealt with questions of difference not Relationships, Independence nor Goodness of Fit. Inferential Descriptive
You would have also noticed that the problem dealt with questions of difference not Relationships, Independence nor Goodness of Fit.
Double check your problem to see if that is the case
Inferential Descriptive
Difference
You would have also noticed that the problem dealt with questions of difference not Relationships, Independence nor Goodness of Fit.
Double check your problem to see if that is the case
Inferential Descriptive
Difference Relationship
You would have also noticed that the problem dealt with questions of difference not Relationships, Independence nor Goodness of Fit.
Double check your problem to see if that is the case
Inferential Descriptive
DifferenceDifference Relationship
You would have also noticed that the problem dealt with questions of difference not Relationships, Independence nor Goodness of Fit.
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of FitDifference Relationship
After checking the data, you noticed that the data was ratio/interval rather than extreme ordinal (1st, 2nd, 3rd place) or nominal (male, female)
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of FitDifference Relationship
After checking the data, you noticed that the data was ratio/interval rather than extreme ordinal (1st, 2nd, 3rd place) or nominal (male, female)
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of Fit
Ratio/Interval
Difference Relationship
After checking the data, you noticed that the data was ratio/interval rather than extreme ordinal (1st, 2nd, 3rd place) or nominal (male, female)
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of Fit
OrdinalRatio/Interval
Difference Relationship
After checking the data, you noticed that the data was ratio/interval rather than extreme ordinal (1st, 2nd, 3rd place) or nominal (male, female)
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of Fit
NominalOrdinalRatio/Interval
Difference Relationship
The distribution was more or less normal rather than skewed or kurtotic.
The distribution was more or less normal rather than skewed or kurtotic.
The distribution was more or less normal rather than skewed or kurtotic.
The distribution was more or less normal rather than skewed or kurtotic.
The distribution was more or less normal rather than skewed or kurtotic.
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of Fit
Skewed
NominalOrdinalRatio/Interval
Difference Relationship
The distribution was more or less normal rather than skewed or kurtotic.
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of Fit
Skewed Kurtotic
NominalOrdinalRatio/Interval
Difference Relationship
The distribution was more or less normal rather than skewed or kurtotic.
Double check your problem to see if that is the case
Inferential Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
NominalOrdinalRatio/Interval
Difference Relationship
Only one Dependent Variable (DV) rather than two or more exist.
Only one Dependent Variable (DV) rather than two or more exist.
DV #1
Chemistry Test Scores
Only one Dependent Variable (DV) rather than two or more exist.
DV #1 DV #2
Chemistry Test Scores
Class Attendance
Only one Dependent Variable (DV) rather than two or more exist.
DV #1 DV #2 DV #3
Chemistry Test Scores
Class Attendance
Homework Completed
Only one Dependent Variable (DV) rather than two or more exist.
Inferential Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
Double check your problem to see if that is the case
NominalOrdinalRatio/Interval
Difference Relationship
Only one Dependent Variable (DV) rather than two or more exist.
Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
1 DV
Double check your problem to see if that is the case
Inferential
NominalOrdinalRatio/Interval
Difference Relationship
Only one Dependent Variable (DV) rather than two or more exist.
Inferential Descriptive
Difference Relationship Difference Goodness of Fit
Ratio/Interval Ordinal Nominal
Skewed Kurtotic Normal
1 DV 2+ DV
Double check your problem to see if that is the case
Only one Independent Variable (DV) rather than two or more exist.
Only one Independent Variable (DV) rather than two or more exist.
IV #1
Use of Innovative eBook
Only one Independent Variable (DV) rather than two or more exist.
IV #1 IV #2
Use of Innovative eBook
Doing Homework to Classical Music
Only one Independent Variable (DV) rather than two or more exist.
IV #1 IV #2 IV #3
Use of Innovative eBook
Doing Homework to Classical Music Gender
Only one Independent Variable (DV) rather than two or more exist.
IV #1 IV #2 IV #3
Use of Innovative eBook
Doing Homework to Classical Music Gender
Only one Independent Variable (DV) rather than two or more exist.
Only one Independent Variable (DV) rather than two or more exist. Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
1 DV 2+ DV
Inferential
NominalOrdinalRatio/Interval
Difference Relationship
Only one Independent Variable (DV) rather than two or more exist. Inferential Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
1 DV 2+ DV
1 IV
Inferential
NominalOrdinalRatio/Interval
Difference Relationship
Only one Independent Variable (DV) rather than two or more exist. Descriptive
Difference Goodness of Fit
Nominal
Skewed Kurtotic Normal
1 DV 2+ DV
1 IV 2+ IV
Inferential
NominalOrdinalRatio/Interval
Difference Relationship Difference
Only one Independent Variable (DV) rather than two or more exist. Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
1 DV 2+ DV
1 IV 2+ IV
Double check your problem to see if that is the case
Inferential
NominalOrdinalRatio/Interval
Difference Relationship Difference
There are three levels of the Independent Variable (IV) rather than just two levels. Note – even though repeated measures ANOVA can analyze just two levels, this is generally analyzed using a paired sample t-test.
There are three levels of the Independent Variable (DV) rather than just two levels. Note – even though repeated measures ANOVA can analyze just two levels, this is generally analyzed using a paired sample t-test.
Level 1
Before using the innovative ebook
There are three levels of the Independent Variable (DV) rather than just two levels. Note – even though repeated measures ANOVA can analyze just two levels, this is generally analyzed using a paired sample t-test.
Level 1 Level 2
Before using the innovative ebook
Using the innovative ebook
for 2 months
There are three levels of the Independent Variable (DV) rather than just two levels. Note – even though repeated measures ANOVA can analyze just two levels, this is generally analyzed using a paired sample t-test.
Level 1 Level 2 Level 3
Before using the innovative ebook
Using the innovative ebook
for 2 months
Using the innovative ebook
for 4 months
Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
1 DV 2+ DVs
2+ IVs
Inferential
NominalOrdinalRatio/Interval
Difference Relationship
2 levels 3+ levels
1 IV
Difference
The samples are repeated rather than independent. Notice that the same class (Chem 100 section 003) is repeatedly tested.
The samples are repeated rather than independent. Notice that the same class (Chem 100 section 003) is repeatedly tested.
Chem 100 Section 003
January
Chem 100 Section 003
March
Chem 100 Section 003
May
Before using the innovative
ebook
Using the innovative ebook
for 2 months
Using the innovative ebook
for 4 months
Descriptive
Difference Goodness of Fit
Skewed Kurtotic Normal
1 DV 2+ DVs
2+ IVs
Inferential
NominalOrdinalRatio/Interval
Difference Relationship
2 levels 3+ levels
1 IV
Difference
RepeatedIndependent
If this was the appropriate path for your problem then you have correctly selected Repeated-measures ANOVA to solve the problem you have been presented.
Repeated Measures ANOVA –
Repeated Measures ANOVA –Another use of analysis of variance is to test whether a single group of people change over time.
Repeated Measures ANOVA –Another use of analysis of variance is to test whether a single group of people change over time.
In this case, the distributions that are compared to each other are not from different groups
In this case, the distributions that are compared to each other are not from different groups
versus
Group 1 Group 2
In this case, the distributions that are compared to each other are not from different groups
versus
Group 1 Group 2
In this case, the distributions that are compared to each other are not from different groups
But from different times.
versus
Group 1 Group 2
In this case, the distributions that are compared to each other are not from different groups
But from different times.
versus
Group 1 Group 2
Group 1 Group 1: Two Months Later
versus
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
January FebruaryApril
Exam 1Exam 2
Exam 3
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
The overall F-ratio will reveal whether there are differences somewhere among three time periods.
January FebruaryApril
Exam 1Exam 2
Exam 3
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
The overall F-ratio will reveal whether there are differences somewhere among three time periods.
January FebruaryApril
Exam 1Exam 2
Exam 3
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
The overall F-ratio will reveal whether there are differences somewhere among three time periods.
January FebruaryApril
Exam 1Exam 2
Exam 3
Average Score
Average Score
Average Score
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
The overall F-ratio will reveal whether there are differences somewhere among three time periods.
January FebruaryApril
Exam 1Exam 2
Exam 3
Average Score
Average Score
Average Score
For example, an instructor might administer the same test three times throughout the semester to ascertain whether students are improving in their skills.
The overall F-ratio will reveal whether there are differences somewhere among three time periods.
January FebruaryApril
Exam 1Exam 2
Exam 3
Average Score
Average Score
Average Score
There is a difference but
we don’t know where
Post hoc tests will reveal exactly where the differences occurred.
Post hoc tests will reveal exactly where the differences occurred.
January FebruaryApril
Exam 1Exam 2
Exam 3
Average Score 35
Average Score 38
Average Score 40
Post hoc tests will reveal exactly where the differences occurred.
January FebruaryApril
Exam 1Exam 2
Exam 3
Average Score 35
Average Score 38
Average Score 40
There is a statistically significant
difference only between Exam 1
and Exam 3
In contrast, with the One-way analysis of Variance (ANOVA) we were attempting to determine if there was a statistical difference between 2 or more (generally 3 or more) groups.
In contrast, with the One-way analysis of Variance (ANOVA) we were attempting to determine if there was a statistical difference between 2 or more (generally 3 or more) groups.In our One-way ANOVA example in another presentation we attempted to determine if there was any statistically significant difference in the amount of Pizza Slices consumed by three different player types (football, basketball, and soccer).
The data would be set up thus:
The data would be set up thus:Football Players
Pizza Slices
Consumed
Basketball Players
Pizza Slices Consumed
Soccer Players
Pizza Slices Consumed
Ben 5 Cam 6 Dan 5
Bob 7 Colby 4 Denzel 8
Bud 8 Conner 8 Dilbert 8
Bubba 9 Custer 4 Don 1
Burt 10 Cyan 2 Dylan 2
The data would be set up thus:
Notice how the individuals in these groups are different (hence different names)
Football Players
Pizza Slices
Consumed
Basketball Players
Pizza Slices Consumed
Soccer Players
Pizza Slices Consumed
Ben 5 Cam 6 Dan 5
Bob 7 Colby 4 Denzel 8
Bud 8 Conner 8 Dilbert 8
Bubba 9 Custer 4 Don 1
Burt 10 Cyan 2 Dylan 2
The data would be set up thus:
Notice how the individuals in these groups are different (hence different names)
Football Players
Pizza Slices
Consumed
Basketball Players
Pizza Slices Consumed
Soccer Players
Pizza Slices Consumed
Ben 5 Cam 6 Dan 5
Bob 7 Colby 4 Denzel 8
Bud 8 Conner 8 Dilbert 8
Bubba 9 Custer 4 Don 1
Burt 10 Cyan 2 Dylan 2
The data would be set up thus:
Notice how the individuals in these groups are different (hence different names)A Repeated Measures ANOVA is different than a One-Way ANOVA in one simply way: Only one group of person or observations is being measured, but they are measured more than one time.
Football Players
Pizza Slices
Consumed
Basketball Players
Pizza Slices Consumed
Soccer Players
Pizza Slices Consumed
Ben 5 Ben 6 Ben 5
Bob 7 Bob 4 Bob 8
Bud 8 Bud 8 Bud 8
Bubba 9 Bubba 4 Bubba 1
Burt 10 Burt 2 Burt 2
The data would be set up thus:
Notice how the individuals in these groups are different (hence different names)A Repeated Measures ANOVA is different than a One-Way ANOVA in one simply way: Only one group of persons or observations is being measured, but they are measured more than one time.
Football Players
Pizza Slices
Consumed
Basketball Players
Pizza Slices Consumed
Soccer Players
Pizza Slices Consumed
Ben 5 Ben 6 Ben 5
Bob 7 Bob 4 Bob 8
Bud 8 Bud 8 Bud 8
Bubba 9 Bubba 4 Bubba 1
Burt 10 Burt 2 Burt 2
Notice the different times football player pizza consumption is being measured.
Football Players
Pizza Slices
Consumed
Pizza Slices Consumed
Pizza Slices Consumed
Ben 5 Ben 6 Ben 5
Bob 7 Bob 4 Bob 8
Bud 8 Bud 8 Bud 8
Bubba 9 Bubba 4 Bubba 1
Burt 10 Burt 2 Burt 2
Notice the different times football player pizza consumption is being measured.
Football Players
Pizza Slices
ConsumedBefore the
Season
Pizza Slices Consumed
During the Season
Pizza Slices Consumed
After the Season
Ben 5 Ben 6 Ben 5
Bob 7 Bob 4 Bob 8
Bud 8 Bud 8 Bud 8
Bubba 9 Bubba 4 Bubba 1
Burt 10 Burt 2 Burt 2
Since only one group is being measured 3 times, each time is dependent on the previous time. By dependent we mean there is a relationship.
Since only one group is being measured 3 times, each time is dependent on the previous time. By dependent we mean there is a relationship.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Since only one group is being measured 3 times, each time is dependent on the previous time. By dependent we mean there is a relationship.
The relationship between the scores is that we are comparing the same person across multiple observations.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
So, Ben’s before-season and during-season and after-season scores have one important thing in common:
So, Ben’s before-season and during-season and after-season scores have one important thing in common:
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
So, Ben’s before-season and during-season and after-season scores have one important thing in common: THESE SCORES ALL BELONG TO BEN.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
So, Ben’s before-season and during-season and after-season scores have one important thing in common: THESE SCORES ALL BELONG TO BEN.
They are subject to all the factors that are special to Ben when consuming pizza, including how much he likes or dislikes, the toppings that are available, the eating atmosphere, etc.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
What we want to find out is – how much the BEFORE, DURING, and AFTER season pizza consuming sessions differ.
What we want to find out is – how much the BEFORE, DURING, and AFTER season pizza consuming sessions differ.But we have to find a way to eliminate the variability that is caused by individual differences that linger across all three eating sessions. Once again we are not interested in the things that make Ben, Ben while eating pizza (like he’s a picky eater). We are interested in the effect of where we are in the season (BEFORE, DURING, and AFTER on Pizza consumption.)
What we want to find out is – how much the BEFORE, DURING, and AFTER season pizza consuming sessions differ.But we have to find a way to eliminate the variability that is caused by individual differences that linger across all three eating sessions. Once again we are not interested in the things that make Ben, Ben while eating pizza (like he’s a picky eater). We are interested in the effect of where we are in the season (BEFORE, DURING, and AFTER on Pizza consumption.)
What we want to find out is – how much the BEFORE, DURING, and AFTER season pizza consuming sessions differ.But we have to find a way to eliminate the variability that is caused by individual differences that linger across all three eating sessions. Once again we are not interested in the things that make Ben, Ben while eating pizza (like he’s a picky eater). We are interested in the effect of where we are in the season (BEFORE, DURING, and AFTER on Pizza consumption.)
That way we can focus just on the differences that are related to WHEN the pizza eating occurred.
That way we can focus just on the differences that are related to WHEN the pizza eating occurred. After running a repeated-measures ANOVA, this is the output that we will get:
That way we can focus just on the differences that are related to WHEN the pizza eating occurred. After running a repeated-measures ANOVA, this is the output that we will get:
Tests of Within-Subjects Effects
Measure: Pizza slices
Source
Type III Sum of
Squares dfMean
Square F Sig.
Between Subjects 21.333 4
Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
This output will help us determine if we reject the null hypothesis:
This output will help us determine if we reject the null hypothesis:There is no significant difference in the amount of pizza consumed by football players before,
during, and/or after the season.
This output will help us determine if we reject the null hypothesis:There is no significant difference in the amount of pizza consumed by football players before,
during, and/or after the season.Or accept the alternative hypothesis:
This output will help us determine if we reject the null hypothesis:There is no significant difference in the amount of pizza consumed by football players before,
during, and/or after the season.Or accept the alternative hypothesis:There is a significant difference in the amount of
pizza consumed by football players before, during, and/or after the season.
To do so, let’s focus on the value .008
To do so, let’s focus on the value .008Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
To do so, let’s focus on the value .008Tests of Within-Subjects Effects
Measure: Pizza slices consumed
Source
Type III Sum of
Squares dfMean
Square F Sig.Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033Total 49.333 14
To do so, let’s focus on the value .008
This means that if we were to reject the null hypothesis, the probability that we would be wrong is 8 times out of 1000. As you remember, if that were to happen, it would be called a Type 1 error.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
Source
Type III Sum of
Squares dfMean
Square F Sig.Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033Total 49.333 14
To do so, let’s focus on the value .008
This means that if we were to reject the null hypothesis, the probability that we would be wrong is 8 times out of 1000. As you remember, if that were to happen, it would be called a Type 1 error.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
Source
Type III Sum of
Squares dfMean
Square F Sig.Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033Total 49.333 14
But it is so unlikely, that we would be willing to take that risk and hence reject the null hypothesis.
But it is so unlikely, that we would be willing to take that risk and hence we reject the null hypothesis.
There IS NO statistically significant difference between the number of slices of pizza consumed
by football players before, during, or after the football season.
But it is so unlikely, that we would be willing to take that risk and hence we reject the null hypothesis.
There IS NO statistically significant difference between the number of slices of pizza consumed
by football players before, during, or after the football season. REJE
CT
And accept the alternative hypothesis:
And accept the alternative hypothesis:
There IS A statistically significant difference between the number of slices of pizza consumed
by football players before, during, or after the football season.
And accept the alternative hypothesis:
There IS A statistically significant difference between the number of slices of pizza consumed
by football players before, during, or after the football season. ACCEPT
Now we do not know which of the three are significantly different from one another or if all three are different. We just know that a difference exists.
Now we do not know which of the three are significantly different from one another or if all three are different. We just know that a difference exists.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Now we do not know which of the three are significantly different from one another or if all three are different. We just know that a difference exists.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Now we do not know which of the three are significantly different from one another or if all three are different. We just know that a difference exists.
Later, we can run what is called a “Post-hoc” test to determine where the difference lies.
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
From this point on – we will delve into the actual calculations and formulas that produce a Repeated-measures ANOVA. If such detail is of interest or a necessity to know, please continue.
How was a significance value of .008 calculated?
How was a significance value of .008 calculated?Let’s begin with the calculation of the various sources of Sums of Squares
How was a significance value of .008 calculated?Let’s begin with the calculation of the various sources of Sums of Squares
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
Source
Type III Sum of
Squares dfMean
Square F Sig.Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033Total 49.333 14
We do this so that we can explain what is causing the scores to vary or deviate.
We do this so that we can explain what is causing the scores to vary or deviate.• Is it error?
We do this so that we can explain what is causing the scores to vary or deviate.• Is it error?• Is it differences between times (before,
during, and after)?
We do this so that we can explain what is causing the scores to vary or deviate.• Is it error?• Is it differences between times (before,
during, and after)?Remember, the full name for sum of squares is the sum of squared deviations about the mean. This will help us determine the amount of variation from each of the possible sources.
Let’s begin by calculating the total sums of squares.
Let’s begin by calculating the total sums of squares.
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
Let’s begin by calculating the total sums of squares.
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
Let’s begin by calculating the total sums of squares.
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means one pizza eating observation for person “I” (e.g., Ben) on
time “j” (e.g., before)
For example:
For example: Pizza Slices Consumed
Football Players Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example: Pizza Slices Consumed
Football Players Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example:
OR
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example:
OR
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example:
OR
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example:
OR
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example:
OR
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
For example:
ETC
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means the average of all of the
observations
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means the average of all of the
observationsThis means one pizza eating observation for
person “I” (e.g., Ben) on time “j” (e.g., before)
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means the average of all of the
observations
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
This means one pizza eating observation for
person “I” (e.g., Ben) on time “j” (e.g., before)
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means the average of all of the
observations
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Average of All Observations
This means one pizza eating observation for
person “I” (e.g., Ben) on time “j” (e.g., before)
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means sum or add
everything up
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means sum or add
everything up
This means the average of
all of the observations
�́�𝑿
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
This means sum or add
everything up
This means the average of
all of the observations
This means one pizza eating observation for
person “I” (e.g., Ben) on time “j” (e.g., before)
Let’s calculate total sums of squares with this data set:
Let’s calculate total sums of squares with this data set:
Pizza Slices ConsumedFootball Players Before the
SeasonDuring the
SeasonAfter the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
To do so we will rearrange the data like so:
To do so we will rearrange the data like so:Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
To do so we will rearrange the data like so:Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
To do so we will rearrange the data like so:Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
Each observation
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.Here is how we
compute the Grand Mean =
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.Here is how we
compute the Grand Mean =
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.Here is how we
compute the Grand Mean =
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Pizza Slices ConsumedFootball Players
Before the Season
During the Season
After the Season
Ben 5 4 4Bob 7 5 5Bud 8 7 6
Bubba 9 8 4Burt 10 7 6
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.Here is how we
compute the Grand Mean =
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Pizza Slices ConsumedFootball Players
Before the Season
During the Season
After the Season
Ben 5 4 4Bob 7 5 5Bud 8 7 6
Bubba 9 8 4Burt 10 7 6
Average of All Observations =
6.3
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Football Players
Season Slices of Pizza
Ben Before 5 -Bob Before 7 -Bud Before 8 -
Bubba Before 9 -Burt Before 10 -Ben During 4 -Bob During 5 -Bud During 7 -
Bubba During 8 -Burt During 7 -Ben After 4 -Bob After 5 -Bud After 6 -
Bubba After 4 -Burt After 6 -
To do so we will rearrange the data like so:We will
subtract each of these values from
the grand mean, square the
result and sum them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Football Players
Season Slices of Pizza
Ben Before 5 -Bob Before 7 -Bud Before 8 -
Bubba Before 9 -Burt Before 10 -Ben During 4 -Bob During 5 -Bud During 7 -
Bubba During 8 -Burt During 7 -Ben After 4 -Bob After 5 -Bud After 6 -
Bubba After 4 -Burt After 6 -
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
𝑆𝑆𝑡𝑜𝑡𝑎𝑙=Σ(𝑋 𝑖𝑗− �́� )2
To do so we will rearrange the data like so:We
will subtract each of these values from the
grand mean, square the result and sum
them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Football Players
Season Slices of Pizza
Ben Before 5 -Bob Before 7 -Bud Before 8 -
Bubba Before 9 -Burt Before 10 -Ben During 4 -Bob During 5 -Bud During 7 -
Bubba During 8 -Burt During 7 -Ben After 4 -Bob After 5 -Bud After 6 -
Bubba After 4 -Burt After 6 -
Football Players
Season Slices of Pizza
Grand Mean
Ben Before 5 - 6.3Bob Before 7 - 6.3Bud Before 8 - 6.3
Bubba Before 9 - 6.3Burt Before 10 - 6.3Ben During 4 - 6.3Bob During 5 - 6.3Bud During 7 - 6.3
Bubba During 8 - 6.3Burt During 7 - 6.3Ben After 4 - 6.3Bob After 5 - 6.3Bud After 6 - 6.3
Bubba After 4 - 6.3Burt After 6 - 6.3
To do so we will rearrange the data like so:
We will subtract each of these values
from the grand mean,
square the result and sum them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Football Players
Season Slices of Pizza
Ben Before 5 -Bob Before 7 -Bud Before 8 -
Bubba Before 9 -Burt Before 10 -Ben During 4 -Bob During 5 -Bud During 7 -
Bubba During 8 -Burt During 7 -Ben After 4 -Bob After 5 -Bud After 6 -
Bubba After 4 -Burt After 6 -
Football Players
Season Slices of Pizza
Grand Mean
Ben Before 5 - 6.3Bob Before 7 - 6.3Bud Before 8 - 6.3
Bubba Before 9 - 6.3Burt Before 10 - 6.3Ben During 4 - 6.3Bob During 5 - 6.3Bud During 7 - 6.3
Bubba During 8 - 6.3Burt During 7 - 6.3Ben After 4 - 6.3Bob After 5 - 6.3Bud After 6 - 6.3
Bubba After 4 - 6.3Burt After 6 - 6.3
Football Players
Season Slices of Pizza
Grand Mean
Ben Before 5 - 6.3 =Bob Before 7 - 6.3 =Bud Before 8 - 6.3 =
Bubba Before 9 - 6.3 =Burt Before 10 - 6.3 =Ben During 4 - 6.3 =Bob During 5 - 6.3 =Bud During 7 - 6.3 =
Bubba During 8 - 6.3 =Burt During 7 - 6.3 =Ben After 4 - 6.3 =Bob After 5 - 6.3 =Bud After 6 - 6.3 =
Bubba After 4 - 6.3 =Burt After 6 - 6.3 =
To do so we will rearrange the data like so:
We will subtract each of these values
from the grand mean,
square the result and sum them all up.
Football Players
BenBobBud
BubbaBurtBenBobBud
BubbaBurtBenBobBud
BubbaBurt
Football Players
Season
Ben BeforeBob BeforeBud Before
Bubba BeforeBurt BeforeBen DuringBob DuringBud During
Bubba DuringBurt DuringBen AfterBob AfterBud After
Bubba AfterBurt After
Football Players
Season Slices of Pizza
Ben Before 5Bob Before 7Bud Before 8
Bubba Before 9Burt Before 10Ben During 4Bob During 5Bud During 7
Bubba During 8Burt During 7Ben After 4Bob After 5Bud After 6
Bubba After 4Burt After 6
Football Players
Season Slices of Pizza
Ben Before 5 -Bob Before 7 -Bud Before 8 -
Bubba Before 9 -Burt Before 10 -Ben During 4 -Bob During 5 -Bud During 7 -
Bubba During 8 -Burt During 7 -Ben After 4 -Bob After 5 -Bud After 6 -
Bubba After 4 -Burt After 6 -
Football Players
Season Slices of Pizza
Grand Mean
Ben Before 5 - 6.3Bob Before 7 - 6.3Bud Before 8 - 6.3
Bubba Before 9 - 6.3Burt Before 10 - 6.3Ben During 4 - 6.3Bob During 5 - 6.3Bud During 7 - 6.3
Bubba During 8 - 6.3Burt During 7 - 6.3Ben After 4 - 6.3Bob After 5 - 6.3Bud After 6 - 6.3
Bubba After 4 - 6.3Burt After 6 - 6.3
Football Players
Season Slices of Pizza
Grand Mean
Ben Before 5 - 6.3 =Bob Before 7 - 6.3 =Bud Before 8 - 6.3 =
Bubba Before 9 - 6.3 =Burt Before 10 - 6.3 =Ben During 4 - 6.3 =Bob During 5 - 6.3 =Bud During 7 - 6.3 =
Bubba During 8 - 6.3 =Burt During 7 - 6.3 =Ben After 4 - 6.3 =Bob After 5 - 6.3 =Bud After 6 - 6.3 =
Bubba After 4 - 6.3 =Burt After 6 - 6.3 =
Football Players
Season Slices of Pizza
Grand Mean
Deviation
Ben Before 5 - 6.3 = -1.3Bob Before 7 - 6.3 = 0.7Bud Before 8 - 6.3 = 1.7
Bubba Before 9 - 6.3 = 2.7Burt Before 10 - 6.3 = 3.7Ben During 4 - 6.3 = -2.3Bob During 5 - 6.3 = -1.3Bud During 7 - 6.3 = 0.7
Bubba During 8 - 6.3 = 1.7Burt During 7 - 6.3 = 0.7Ben After 4 - 6.3 = -2.3Bob After 5 - 6.3 = -1.3Bud After 6 - 6.3 = -0.3
Bubba After 4 - 6.3 = -2.3Burt After 6 - 6.3 = -0.3
To do so we will rearrange the data like so:
We will subtract each of these values from the grand mean, square the result and sum them all up.
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
To do so we will rearrange the data like so:
We will subtract each of these values from the grand mean, square the result and sum them all up.
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
= 49.3
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
To do so we will rearrange the data like so:
Then –
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
= 49.3
To do so we will rearrange the data like so:
Then – we place the total sums of squares result in the ANOVA table.
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
= 49.3
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
To do so we will rearrange the data like so:
Then – we place the total sums of squares result in the ANOVA table.
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
= 49.3
Then – we place the total sums of squares result in the ANOVA table.
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
= 49.3
Then – we place the total sums of squares result in the ANOVA table.
Football Players
Season Slices of Pizza
Grand Mean
Deviation Squared
Ben Before 5 - 6.3 = -1.3 1.8Bob Before 7 - 6.3 = 0.7 0.4Bud Before 8 - 6.3 = 1.7 2.8
Bubba Before 9 - 6.3 = 2.7 7.1Burt Before 10 - 6.3 = 3.7 13.4Ben During 4 - 6.3 = -2.3 5.4Bob During 5 - 6.3 = -1.3 1.8Bud During 7 - 6.3 = 0.7 0.4
Bubba During 8 - 6.3 = 1.7 2.8Burt During 7 - 6.3 = 0.7 0.4Ben After 4 - 6.3 = -2.3 5.4Bob After 5 - 6.3 = -1.3 1.8Bud After 6 - 6.3 = -0.3 0.1
Bubba After 4 - 6.3 = -2.3 5.4Burt After 6 - 6.3 = -0.3 0.1
= 49.3
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
We have now calculated the total sums of squares. This is a good starting point. Because now we want to know of that total sums of squares how many sums of squares are generated from the following sources:
We have now calculated the total sums of squares. This is a good starting point. Because now we want to know of that total sums of squares how many sums of squares are generated from the following sources:• Between subjects (this is the variance we
want to eliminate)
We have now calculated the total sums of squares. This is a good starting point. Because now we want to know of that total sums of squares how many sums of squares are generated from the following sources:• Between subjects (this is the variance we
want to eliminate)• Between Groups (this would be between
BEFORE, DURING, AFTER)
We have now calculated the total sums of squares. This is a good starting point. Because now we want to know of that total sums of squares how many sums of squares are generated from the following sources:• Between subjects (this is the variance we
want to eliminate)• Between Groups (this would be between
BEFORE, DURING, AFTER)• Error (the variance that we cannot explain
with our design)
With these sums of squares we will be able to compute our F ratio value and then statistical significance.
With these sums of squares we will be able to compute our F ratio value and then statistical significance.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
With these sums of squares we will be able to compute our F ratio value and then statistical significance.
Let’s calculate the sums of squares between subjects.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Remember if we were just computing a one way ANOVA the table would go from this:
Remember if we were just computing a one way ANOVA the table would go from this:
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Remember if we were just computing a one way ANOVA the table would go from this:
To this:
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Remember if we were just computing a one way ANOVA the table would go from this:
To this:
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 2.669 .078
Error 29.600 8 3.700
Total 49.333 14
Remember if we were just computing a one way ANOVA the table would go from this:
To this:
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 2.669 .078
Error 29.600 8 3.700
Total 49.333 14
All of that variability goes into the error or within groups sums of squares (29.600) which makes the F statistic smaller (from 9.548 to 2.669), the significance value no longer significant (.008 to .078).
All of that variability goes into the error or within groups sums of squares (29.600) which makes the F statistic smaller (from 9.548 to 2.669), the significance value no longer significant (.008 to .078).But the difference in within groups variability is not a function of error, it is a function of Ben, Bob, Bud, Bubba, and Burt’s being different in terms of the amount of slices they eat regardless of when they eat!
All of that variability goes into the error or within groups sums of squares (29.600) which makes the F statistic smaller (from 9.548 to 2.669), the significance value no longer significant (.008 to .078).But the difference in within groups variability is not a function of error, it is a function of Ben, Bob, Bud, Bubba, and Burt’s being different in terms of the amount of slices they eat regardless of when they eat!
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 5 4 4 4.3Bob 7 5 5 5.7Bud 8 7 6 7.0
Bubba 9 8 4 7.0Burt 10 7 6 7.7
Here is a data set where there are not between group differences, but there is a lot of difference based on when the group eats their pizza:
Here is a data set where there are not between group differences, but there is a lot of difference based on when the group eats their pizza:
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 1 5 9 5.0Bob 2 5 8 5.0Bud 3 5 7 5.0
Bubba 1 5 9 5.0Burt 2 5 8 5.0
Here is a data set where there are not between group differences, but there is a lot of difference based on when the group eats their pizza:
There is no variability between subjects (they are all 5.0).
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 1 5 9 5.0Bob 2 5 8 5.0Bud 3 5 7 5.0
Bubba 1 5 9 5.0Burt 2 5 8 5.0
Look at the variability between groups:
Look at the variability between groups: Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average
Ben 1 5 9 5.0Bob 2 5 8 5.0Bud 3 5 7 5.0
Bubba 1 5 9 5.0Burt 2 5 8 5.0
1.8 5.0 8.2
Look at the variability between groups:
They are very different from one another.
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 1 5 9 5.0Bob 2 5 8 5.0Bud 3 5 7 5.0
Bubba 1 5 9 5.0Burt 2 5 8 5.0
1.8 5.0 8.2
Here is what the ANOVA table would look like:
Here is what the ANOVA table would look like:Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 0.000 4Between Groups 102.400 2 51.200 73.143 .000
Error 5.600 8 0.700
Total 49.333 14
Here is what the ANOVA table would look like:
Notice how there are no sum of squares values for the between subjects source of variability!
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 0.000 4Between Groups 102.400 2 51.200 73.143 .000
Error 5.600 8 0.700
Total 49.333 14
Here is what the ANOVA table would look like:
Notice how there are no sum of squares values for the between subjects source of variability!But there is a lot of sum of squares values for the between groups.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 0.000 4Between Groups 102.400 2 51.200 73.143 .000
Error 5.600 8 0.700
Total 49.333 14
Here is what the ANOVA table would look like:
Notice how there are no sum of squares values for the between subjects source of variability!But there is a lot of sum of squares values for the between groups.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 0.000 4Between Groups 102.400 2 51.200 73.143 .000
Error 5.600 8 0.700
Total 49.333 14
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 0.000 4Between Groups 102.400 2 51.200 73.143 .000
Error 5.600 8 0.700
Total 49.333 14
What would the data set look like if there was very little between groups (by season) variability and a great deal of between subjects variability:
What would the data set look like if there was very little between groups (by season) variability and a great deal of between subjects variability:Here it is:
What would the data set look like if there was very little between groups (by season) variability and a great deal of between subjects variability:Here it is:
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average
Ben 3 3 3 3.0
Bob 5 5 5 5.0
Bud 7 7 7 7.0
Bubba 8 8 8 8.0
Burt 12 12 13 12.3
Between Subjects
In this case the between subjects (Ben, Bob, Bud . . .), are very different.
In this case the between subjects (Ben, Bob, Bud . . .), are very different.When you see between SUBJECTS averages that far away, you know that the sums of squares for between groups will be very large.
In this case the between subjects (Ben, Bob, Bud . . .), are very different.When you see between SUBJECTS averages that far away, you know that the sums of squares for between groups will be very large.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 148.267 4Between Groups 0.133 2 0.067 1.000 .689
Error 0.533 8 0.067
Total 148.933 14
Notice, in contrast, as we compute the between group (seasons) average how close they are.
Notice, in contrast, as we compute the between group (seasons) average how close they are.
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 3 3 3 3.0Bob 5 5 5 5.0Bud 7 7 7 7.0
Bubba 8 8 8 8.0Burt 12 12 13 12.3
7.0 7.0 7.2
Notice, in contrast, as we compute the between group (seasons) average how close they are.
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 3 3 3 3.0Bob 5 5 5 5.0Bud 7 7 7 7.0
Bubba 8 8 8 8.0Burt 12 12 13 12.3
7.0 7.0 7.2
Between Groups
Notice, in contrast, as we compute the between group (seasons) average how close they are.
Pizza Slices Consumed Football Players
Before the Season
During the Season
After the Season
Average
Ben 3 3 3 3.0Bob 5 5 5 5.0Bud 7 7 7 7.0
Bubba 8 8 8 8.0Burt 12 12 13 12.3
7.0 7.0 7.2
Between Groups
When you see between group averages this close you know that the sums of squares for between groups will be very small.
When you see between group averages this close you know that the sums of squares for between groups will be very small.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 148.267 4Between Groups 0.133 2 0.067 1.000 .689
Error 0.533 8 0.067
Total 148.933 14
When you see between group averages this close you know that the sums of squares for between groups will be very small.
Now that we have conceptually considered the sources of variability as described by the sum of squares, let’s begin calculating between subjects, between groups, and the error sources.
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 148.267 4Between Groups 0.133 2 0.067 1.000 .689
Error 0.533 8 0.067
Total 148.933 14
We will begin with calculating Between Subjects sum of squares.
We will begin with calculating Between Subjects sum of squares.To do so, let’s return to our original data set:
We will begin with calculating Between Subjects sum of squares.To do so, let’s return to our original data set:
Pizza Slices ConsumedFootball Players
Before the Season
During the Season
After the Season
Ben 5 4 4Bob 7 5 5Bud 8 7 6
Bubba 9 8 4Burt 10 7 6
We will begin with calculating Between Subjects sum of squares.To do so, let’s return to our original data set:
Here is the formula for calculating SS between subjects.
Pizza Slices ConsumedFootball Players
Before the Season
During the Season
After the Season
Ben 5 4 4Bob 7 5 5Bud 8 7 6
Bubba 9 8 4Burt 10 7 6
We will begin with calculating Between Subjects sum of squares.To do so, let’s return to our original data set:
Here is the formula for calculating SS between subjects.
Pizza Slices ConsumedFootball Players
Before the Season
During the Season
After the Season
Ben 5 4 4Bob 7 5 5Bud 8 7 6
Bubba 9 8 4Burt 10 7 6
𝑆𝑆𝑏𝑒𝑡𝑤𝑒𝑒𝑛 𝑠𝑢𝑏𝑗𝑒𝑐𝑡𝑠=𝑘∗ Σ(𝑋𝑏𝑠− �́� )2
𝑆𝑆𝑏𝑒𝑡𝑤𝑒𝑒𝑛 𝑠𝑢𝑏𝑗𝑒𝑐𝑡𝑠=𝑘∗ Σ(𝑿𝒃𝒔− �́� )2
𝑆𝑆𝑏𝑒𝑡𝑤𝑒𝑒𝑛 𝑠𝑢𝑏𝑗𝑒𝑐𝑡𝑠=𝑘∗ Σ(𝑿𝒃𝒔− �́� )2 Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average
Ben 5 4 4 4.3
Bob 7 5 5 5.7
Bud 8 7 6 7.0
Bubba 9 8 4 7.0
Burt 10 7 6 7.7
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average
Ben 5 4 4 4.3
Bob 7 5 5 5.7
Bud 8 7 6 7.0
Bubba 9 8 4 7.0
Burt 10 7 6 7.7
𝑆𝑆𝑏𝑒𝑡𝑤𝑒𝑒𝑛 𝑠𝑢𝑏𝑗𝑒𝑐𝑡𝑠=𝑘∗ Σ(𝑿𝒃𝒔− �́� )2This means the average of between
subjects
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average minus
Ben 5 4 4 4.3 -
Bob 7 5 5 5.7 -
Bud 8 7 6 7.0 -
Bubba 9 8 4 7.0 -
Burt 10 7 6 7.7 -
𝑆𝑆𝑏𝑒𝑡𝑤𝑒𝑒𝑛 𝑠𝑢𝑏𝑗𝑒𝑐𝑡𝑠=𝑘∗ Σ(𝑿𝒃𝒔− �́� )2
This means the average of all of the observations
Here is how we calculate the grand mean again:
Here is how we calculate the grand mean again: Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Average of All Observations =
6.3
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average minus Grand Mean
Ben 5 4 4 4.3 - 6.3
Bob 7 5 5 5.7 - 6.3
Bud 8 7 6 7.0 - 6.3
Bubba 9 8 4 7.0 - 6.3
Burt 10 7 6 7.7 - 6.3
This means the average of all of the observations
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean.
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean.
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average minus Grand Mean
Deviation
Ben 5 4 4 4.3 - 6.3 -2.0
Bob 7 5 5 5.7 - 6.3 -0.6
Bud 8 7 6 7.0 - 6.3 0.7
Bubba 9 8 4 7.0 - 6.3 0.7
Burt 10 7 6 7.7 - 6.3 1.4
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations.
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations.
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations.Then we sum all of these squared deviations.
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations.Then we sum all of these squared deviations.
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations.Then we sum all of these squared deviations.
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Sum up
Here is how we calculate the grand mean again:Now we subtract each subject or person average from the Grand Mean.This gives us the person’s average score deviation from the total or grand mean. Now we will square the deviations.Then we sum all of these squared deviations.Finally, we multiply the sum all of these squared deviations by the number of groups:
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
Number of conditions
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
1 2 3
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
1 2 3
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
1 2 3
Pizza Slices Consumed
Football Players
Before the
Season
During the Season
After the Season
Average minus Grand Mean
Deviation Squared
Ben 5 4 4 4.3 - 6.3 -2.0 3.9
Bob 7 5 5 5.7 - 6.3 -0.6 0.4
Bud 8 7 6 7.0 - 6.3 0.7 0.5
Bubba 9 8 4 7.0 - 6.3 0.7 0.5
Burt 10 7 6 7.7 - 6.3 1.4 1.9
7.1
Times 3 groups
Sum of Squares Between Subjects 21.3
1 2 3
Tests of Within-Subjects Effects
Measure: Pizza slices consumed
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Now it is time to compute the between groups (seasons) sum of squares.
Now it is time to compute the between groups’ (seasons) sum of squares.
Here is the equation we will use to compute it:
Now it is time to compute the between groups’ (seasons) sum of squares.
Here is the equation we will use to compute it:
Let’s break this down with our data set:
Let’s break this down with our data set:
Let’s break this down with our data set:
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
We begin by computing the mean of each condition (k)
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
We begin by computing the mean of each condition (k)
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8
We begin by computing the mean of each condition (k)
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8
We begin by computing the mean of each condition (k)
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8
We begin by computing the mean of each condition (k)
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
Then subtract each condition mean from the grand mean.
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
Then subtract each condition mean from the grand mean.
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
minus - - -
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
minus - - -
Grand Mean
6.3 6.3 6.3
Then subtract each condition mean from the grand mean.
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
minus - - -
Grand Mean
6.3 6.3 6.3
equals
Deviation 1.5 -0.1 -1.3
Then subtract each condition mean from the grand mean.
Square the deviation.
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
minus - - -
Grand Mean
6.3 6.3 6.3
equals
Deviation 1.5 -0.1 -1.3
Squared Deviation
2.2 0.0 1.8
Sum the Squared Deviations:
Sum the Squared Deviations:
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
minus - - -
Grand Mean
6.3 6.3 6.3
equals
Deviation 1.5 -0.1 -1.3
Squared Deviation
2.2 0.0 1.8
Sum
Sum the Squared Deviations:
Bubba 9 8 4
Burt 10 7 6
Condition Mean
7.8 6.2 5.0
minus - - -
Grand Mean
6.3 6.3 6.3
equals
Deviation 1.5 -0.1 -1.3
Squared Deviation
2.2 0.0 1.8
Sum
Sum the Squared Deviations:
3.95
Sum of Squared Deviations
Multiply by the number of observations per condition (number of pizza eating slices across before, during, and after).
Multiply by the number of observations per condition (number of pizza eating slices across before, during, and after).
3.95
Sum of Squared Deviations
Multiply by the number of observations per condition (number of pizza eating slices across before, during, and after).
3.95
Sum of Squared Deviations
Multiply by the number of observations per condition (number of pizza eating slices across before, during, and after).
3.95
Sum of Squared Deviations
5
Number of observations
Multiply by the number of observations per condition (number of pizza eating slices across before, during, and after).
3.95
Sum of Squared Deviations
5
Number of observations
Multiply by the number of observations per condition (number of pizza eating slices across before, during, and after).
3.95
Sum of Squared Deviations
5
Number of observations
19.7Weighted Sum of
Squared Deviations
Let’s return to the ANOVA table and put the weighted sum of squared deviations.
Let’s return to the ANOVA table and put the weighted sum of squared deviations.
Tests of Within-Subjects Effects
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Let’s return to the ANOVA table and put the weighted sum of squared deviations.
Tests of Within-Subjects Effects
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
3.95
Sum of Squared Deviations
5
Number of observations
19.7Weighted Sum of
Squared Deviations
Let’s return to the ANOVA table and put the weighted sum of squared deviations.
Tests of Within-Subjects Effects
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
3.95
Sum of Squared Deviations
5
Number of observations
19.7Weighted Sum of
Squared Deviations
So far we have calculated Total Sum of Squares along with Sum of Squares for Between Subjects, and Between Groups.
So far we have calculated Total Sum of Squares along with Sum of Squares along with Sum of Squares for Between Subjects, Between Groups.
Tests of Within-Subjects Effects
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Now we will calculate the sum of squares associated with Error.
Now we will calculate the sum of squares associated with Error.
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
To do this we simply add the between subjects and between groups sums of squares.
To do this we simply add the between subjects and between groups sums of squares.
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
To do this we simply add the between subjects and between groups sums of squares.
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
21.333
Between Subjects Sum of Squares
19.733
Between Groups Sum of Squares
41.600
Between Subjects & Groups Sum of
Squares Combined
Then we subtract the Between Subjects & Group Sum of Squares Combined (41.600) from the Total Sum of Squares (49.333)
Then we subtract the Between Subjects & Group Sum of Squares Combined (41.600) from the Total Sum of Squares (49.333)
49.333
Total Sum of Squares
41.600 Between Subjects &
Groups Sum of Squares Combined
8.267
Sum of Squares Attributed to Error
or Unexplained
Then we subtract the Between Subjects & Group Sum of Squares Combined (41.600) from the Total Sum of Squares (49.333)
49.333
Total Sum of Squares
41.600 Between Subjects &
Groups Sum of Squares Combined
8.267
Sum of Squares Attributed to Error
or Unexplained
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Now we have all of the information necessary to determine if there is a statistically significant difference between pizza slices consumed by football players between three different eating occasions (before, during or after the season).
Now we have all of the information necessary to determine if there is a statistically significant difference between pizza slices consumed by football players between three different eating occasions (before, during or after the season).
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
To calculate the significance level
To calculate the significance levelSource
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
We must calculate the F ratio
We must calculate the F ratioSource
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Which is calculated by dividing the Between Groups Mean Square value (9.867) by the Error Mean Square value (1.033).
Which is calculated by dividing the Between Groups Mean Square value (9.867) by the Error Mean Square value (1.033).
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
=
Which is calculated by dividing the sum of squares between groups by its degrees of freedom, as shown below:
Which is calculated by dividing the sum of squares between groups by its degrees of freedom, as shown below:
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
=
Which is calculated by dividing the sum of squares between groups by its degrees of freedom, as shown below:
And
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
=
Which is calculated by dividing the sum of squares between groups by its degrees of freedom, as shown below:
And
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14 =
=
Which is calculated by dividing the sum of squares between groups by its degrees of freedom, as shown below:
And
Now we need to figure out how we calculate degrees of freedom for each source of sums of squares.
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14 =
=
Let’s begin with determining the degrees of freedom Between Subjects.
Let’s begin with determining the degrees of freedom Between Subjects.
Let’s begin with determining the degrees of freedom Between Subjects.
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Let’s begin with determining the degrees of freedom Between Subjects.
We take the number of subjects which, in this case, is 5 – 1 = 4
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Let’s begin with determining the degrees of freedom Between Subjects.
We take the number of subjects which, in this case, is 5 – 1 = 4
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Let’s begin with determining the degrees of freedom Between Subjects.
We take the number of subjects which, in this case, is 5 – 1 = 4
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Average
Ben 3 3 3 3.0
Bob 5 5 5 5.0
Bud 7 7 7 7.0
Bubba 8 8 8 8.0
Burt 12 12 13 12.3
Between Subjects
1
2
3
4
5
Now – onto Between Groups Degrees of Freedom (df)
Now – onto Between Groups Degrees of Freedom (df)
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now – onto Between Groups Degrees of Freedom (df)
We take the number of groups which in this case is 3 – 1 = 2
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now – onto Between Groups Degrees of Freedom (df)
We take the number of groups which in this case is 3 – 1 = 2
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now – onto Between Groups Degrees of Freedom (df)
We take the number of groups which in this case is 3 – 1 = 2
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
1 2 3
Now – onto Between Groups Degrees of Freedom (df)
We take the number of groups which in this case is 3 – 1 = 2
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Pizza Slices Consumed
Football Players
Before the Season
During the Season
After the Season
Ben 5 4 4
Bob 7 5 5
Bud 8 7 6
Bubba 9 8 4
Burt 10 7 6
1 2 3
The error degrees of freedom are calculated by multiplying the between subjects by the between groups degrees of freedom.
The error degrees of freedom are calculated by multiplying the between subjects by the between groups degrees of freedom.
4
Between Subjects Degrees of Freedom
2
Between Groups Degrees of Freedom
8Error Degrees of
Freedom
The error degrees of freedom are calculated by multiplying the between subjects by the between groups degrees of freedom.
4
Between Subjects Degrees of Freedom
2
Between Groups Degrees of Freedom
8Error Degrees of
Freedom
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
The error degrees of freedom are calculated by multiplying the between subjects by the between groups degrees of freedom.
4
Between Subjects Degrees of Freedom
2
Between Groups Degrees of Freedom
8Error Degrees of
Freedom
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
The degrees of freedom for total sum of squares is calculated by adding all of the degrees of freedom from the other three sources.
The degrees of freedom for total sum of squares is calculated by adding all of the degrees of freedom from the other three sources.
4 2 8 14
The degrees of freedom for total sum of squares is calculated by adding all of the degrees of freedom from the other three sources.
4 2 8 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
The degrees of freedom for total sum of squares is calculated by adding all of the degrees of freedom from the other three sources.
4 2 8 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
We will compute the Mean Square values for just the Between Groups and Error. We are not interested in what is happening with Between Subjects. We calculated the Between Subjects sum of squares only take out any differences that are a function of differences that would exist regardless of what group we were looking at.
Once again, if we had not pulled out Between Subjects sums of squares, then the Between Subjects would be absorbed in the error value:
Once again, if we had not pulled out Between Subjects sums of squares, then the Between Subjects would be absorbed in the error value:
Tests of Within-Subjects Effects
Measure: Pizza_slices
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Once again, if we had not pulled out Between Subjects sums of squares, then the Between Subjects would be absorbed in the error value:
Tests of Within-Subjects Effects
Measure: Pizza_slices
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047Within Groups 29.600 8 1.033
Total 49.333 14
Once again, if we had not pulled out Between Subjects sums of squares, then the Between Subjects would be absorbed in the error value:
Tests of Within-Subjects Effects
Measure: Pizza_slices
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047Within Groups 29.600 8 1.033
Total 49.333 14
Once again, if we had not pulled out Between Subjects sums of squares, then the Between Subjects would be absorbed in the error value:
Tests of Within-Subjects Effects
Measure: Pizza_slices
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047Within Groups 29.600 8 1.033
Total 49.333 14
Within Groups is another way of
saying Error
And that would have created a larger error mean square value:
And that would have created a larger error mean square value:
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047
Error 29.600 12 2.467
Total 49.333 14
And that would have created a larger error mean square value:
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047
Error 29.600 12 2.467
Total 49.333 14
Which in turn would have created a smaller F value:
Which in turn would have created a smaller F value:
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047
Error 29.600 12 2.467
Total 49.333 14
Which in turn would have created a smaller F value:
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047
Error 29.600 12 2.467
Total 49.333 14
=
=
Which in turn would have created a larger significance value:
Which in turn would have created a larger significance value:
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047
Error 29.600 12 2.467
Total 49.333 14
Which in turn would have created a larger significance value:
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4 Between Groups 19.733 2 9.867 9.548 .008
Error 8.267 8 1.033
Total 49.333 14
Measure: Pizza_slices
Source Type III Sum of Squares df
Mean Square F Sig.
Between Groups 19.733 2 9.867 4.000 .047
Error 29.600 12 2.467
Total 49.333 14
=
=
With a larger significance value it makes it less likely to reject the null hypothesis.
With a larger significance value it makes it less likely to reject the null hypothesis.It is for that reason that we calculate the Between Subjects sums of squares and pull it out of the error sums of squares to get an uncontaminated error value…
With a larger significance value it makes it less likely to reject the null hypothesis.It is for that reason that we calculate the Between Subjects sums of squares and pull it out of the error sums of squares to get an uncontaminated error value…
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
With a larger significance value it makes it less likely to reject the null hypothesis.It is for that reason that we calculate the Between Subjects sums of squares and pull it out of the error sums of squares to get an uncontaminated error value…
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
With a larger significance value it makes it less likely to reject the null hypothesis.It is for that reason that we calculate the Between Subjects sums of squares and pull it out of the error sums of squares to get an uncontaminated error value…
And a more accurate F value…
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
With a larger significance value it makes it less likely to reject the null hypothesis.It is for that reason that we calculate the Between Subjects sums of squares and pull it out of the error sums of squares to get an uncontaminated error value…
And a more accurate F value…
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
…as well as a more accurate Significance value…
…as well as a more accurate Significance value…Source
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
…as well as a more accurate Significance value…
Therefore, we will only focus on mean square values for Between Groups and Error:
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
…as well as a more accurate Significance value…
Therefore, we will only focus on mean square values for Between Groups and Error:
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
As previously demonstrated, let’s continue with our calculations by dividing the Between Groups mean square value (9.867) by the Error mean square value (1.033).
As previously demonstrated, let’s continue with our calculations by dividing the Between Groups mean square value (9.867) by the Error mean square value (1.033).
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
As previously demonstrated, let’s continue with our calculations by dividing the Between Groups mean square value (9.867) by the Error mean square value (1.033).
Which gives us an F value of 9.548
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
=
Because we are using statistical software we will also get a significance value of .008. This means that is we were to theoretically run this experiment 1000 times we would be wrong to reject the null hypothesis 8 times this incurring a type 1 error.
Because we are using statistical software we will also get a significance value of .008. This means that is we were to theoretically run this experiment 1000 times we would be wrong to reject the null hypothesis 8 times this incurring a type 1 error.If we are willing to live with those odds of failure (8 out of 1000) then we would reject the null hypothesis.
If we had set our alpha cut off at .05 that would mean we would be willing to take the risk of being wrong 50 out of 1000 or 5 out of 100 times.
If we had set our alpha cut off at .05 that would mean we would be willing to take the risk of being wrong 50 out of 1000 or 5 out of 100 times.If we do not get a significance value (.008) then we could go to the F table to determine if our F value of 9.548 exceeds the F critical value in the F table.
This F critical value is located using the degrees of freedom for error (8) and the degrees of freedom for between groups (2).
This F critical value is located using the degrees of freedom for error (8) and the degrees of freedom for between groups (2).
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Error df
This F critical value is located using the degrees of freedom for error (8) and the degrees of freedom for between groups (2).
This F critical value is located using the degrees of freedom for error (8) and the degrees of freedom for between groups (2).
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
BG df
Now let’s put them together:
Now let’s put them together:Source
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now let’s put them together:Source
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
BG df
Error df
Now let’s put them together:Source
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
BG df
Error df
Now let’s put them together:Source
Type III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
BG df
Error df
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now let’s put them together:
Now let’s put them together:
Since 9.548 exceeds 4.46 at the .05 alpha level, we will reject the null hypothesis.
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now let’s put them together:
Since 9.548 exceeds 4.46 at the .05 alpha level, we will reject the null hypothesis.
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now let’s put them together:
Since 9.548 exceeds 4.46 at the .05 alpha level, we will reject the null hypothesis.Once again, we only show you the table as another way to determine if you have statistical significance.
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14
Now let’s put them together:
Since 9.548 exceeds 4.46 at the .05 alpha level, we will reject the null hypothesis.Once again, we only show you the table as another way to determine if you have statistical significance.That’s it. You have now seen the inner workings of Repeated Measures ANOVA.
SourceType III Sum of Squares df
Mean Square F Sig.
Between Subjects 21.333 4Between Groups 19.733 2 9.867 9.548 .008Error 8.267 8 1.033
Total 49.333 14