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IST 1051Computational Tools for Statistics I

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DEÜ, Department of Statistics

Sorting Data ‐Minitab• You can sort one or more columns of data

according to values in the associatedcolumn(s) you select.

• Sorting alphabetizes or numerically orders thedata and carries along the associatedcolumns.

• You can sort in ascending or descendingorder, and you can specify whether thesorted data should be stored in the originalcolumns, other columns you specify, or in anew worksheet.

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Sorting Data ‐Minitab

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Sort

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Example• Open worksheet ABCSales.MTW

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Example

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Example

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ABCSales.mtw

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ABCSales.mtw• Sort Index, Month and Sales data with respect to

Sales in ascending order

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ABCSales.mtw• Sort Index, Month and Sales data with respect to

Sales in ascending order

MTB > sort c1 c2 c3 c7 c8 c9;SUBC> by c3.

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ABCSales.mtw• Sort Index, Month and Sales data with respect to

Sales in descending order

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ABCSales.mtw• Sort Index, Month and Sales data with respect to

Sales in descending order

MTB > sort c1 c2 c3 c7 c8 c9;SUBC> by c3;SUBC> descending c3.

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Example• Open "Bears" Data

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Bears.mtw• Sort Age, Sex and Weight data with respect to Age and

Sex in descending and ascending order respectively

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Bears.mtw• Sort Age, Sex and Weight data with respect to Age

and Sex in descending and ascending orderrespectively

MTB > sort c2 c4 c10 c14 c15 c16;SUBC> by c2 c4;SUBC> descending c2.

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SPSS‐SORTING CASES• To sort the data file based on another variable from

the IBM SPSS main menu select Data ➔ Sort Cases

• This produces the Sort Cases dialog window

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SPSS‐SORTING CASES

• File Open Data• (C:\Program Files\...\SPSS\...\Samples\ accidents.sav

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SPSS‐SORTING CASES• Data ➔ Sort Cases

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SPSS‐SORTING CASES

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SPSS‐SORTING CASES

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SPSS‐SORTING CASES

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R – sort function

• sort(x, decreasing = FALSE)

• Sort a vector into ascending or descending order.

>x<-c(3,5,12,6,7,10,7,2,4,9,3,2)>sort(x)[1] 2 2 3 3 4 5 6 7 7 9 10 12

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How can you sort the values in decreasing order?

> sort(x,decreasing=TRUE)

[1] 12 10 9 7 7 6 5 4 3 3 2 2

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R – sort function

• What is the sum of the three largest values in x?

> sum(sort(x,T)[1:3])

[1] 31

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R – sort function

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Frequencies

Example: Shippingdata• Open WorksheetMeet MINITAB/Shippingdata.MTW

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Minitab ‐ Tally• Use to display counts, cumulative counts, percents,

and cumulative percents for each specified variable.

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Tally

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Tally

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Tally

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Tally

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Tally Subcommands• COUNTS Displays the count for each category

• CUMCOUNTS Displays the cumulative counts for eachcategory

• PERCENTS Displays what percentage of the whole is accounted for by each category

• CUMPERCENTS Displays the cumulative percents for each category

• ALL Displays counts, cumulative counts, percents, and cumulative percents for each category

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TallyMTB > tally c1 c5;SUBC> counts;SUBC> percents.

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SPSS‐FREQUENCIES

• File Open Data• (C:\Program Files\...\SPSS\...\Samples\ bankloan.sav

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SPSS‐FREQUENCIES• Analyze Descriptive Statistics Frequencies

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SPSS‐FREQUENCIES

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R – table() function

> x<-c(rep("A",5),rep("B",8),rep("C",3),rep("D",10))> x[1] "A" "A" "A" "A" "A" "B" "B" "B" "B" "B" "B" "B" "B" "C" "C" "C" "D" "D" "D"[20] "D" "D" "D" "D" "D" "D" "D"

> table(x)xA B C D 5 8 3 10

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R > LETTERS[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S"

[20] "T" "U" "V" "W" "X" "Y" "Z"

> letters[1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s"

[20] "t" "u" "v" "w" "x" "y" "z"

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R – table() function

> x<-rep(LETTERS[1:5],c(3,5,6,7,9))> x[1] "A" "A" "A" "B" "B" "B" "B" "B" "C" "C" "C" "C" "C" "C" "D" "D" "D" "D" "D"

[20] "D" "D" "E" "E" "E" "E" "E" "E" "E" "E" "E"

> table(x)xA B C D E 3 5 6 7 9

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