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Outline of the different types of graphs and charts and some things to watch out for.
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Using Charts and
Graphs
Types of Graphs
Types
� Bar/Column
� Line
� Pie
� Scatter
Why
� Trends
� Comparisons
� Quicker/Easier to understand
Column or Bar
“Discrete” Data
No half values on the category axis
0
10
20
30
40
Unit 1 Unit 2 Unit 3 Unit 4 0 20 40
Unit 1
Unit 2
Unit 3
Unit 4
Line
0
20
40
60
2005 2006 2007 2008 2009 2010
Staff Turnover
0
20
40
60
80
Jan Feb March April
Sales
Tesco
Asda
Continuous data
Often with time on X axis
Trends
PieFavourite Sports
Rugby
Football
Tennis
Cricket
Percentage and Proportion
Only for full data sets
Girls
Boys
Class Gender Distribution
Scatter
Experimental Results
Looking for trends or correlation
“Trend line” or
“Line of best fit”
0
5
10
15
20
0 2 4 6 8 100
5
10
0 2 4 6 8 10
Look out for…
0
50
100
Skewed range
Compressed scale
Incorrect range in Excel – e.g. including the total row
Choose Start Point
0
100
90
100
www.statswales.wales.gov.uk
www.statistics.gov.uk
www.informationisbeautiful.net
www.coolinfographics.com
Sources for statistics
