Comparing data sets – shared horizons
Start data that are likely to be compared from the same point on a chart – a shared horizon. Use a clustered chart to compare values; only the first category is easily comparable in stacked bar charts.
Do
Example of chart allowing easy comparisons
Adoptions by sex
England and Wales, 1998 to 2012
Do not
Example of stacked bar chart where comparability is more difficult
Adoptions by sex
England and Wales, 1998 to 2012