2. Pie Charts

-Used to describe categorical data in terms of percentage of the whole.

-Can only be used to describe categories who completely describe the variable of interest – if one is only interested in a subset of the values that a categorical variable takes on or if you have categories that come from different groups (e.g. the percentage of students who are female enrolled in CAS, enrolled in SPA, enrolled in SIS, etc.) then it is necessary to use a bar chart instead of a pie chart.

-To construct a pie chart, divide a circle into segments where the size of each segment represents the proportion of observations falling into that category as a percent of the whole.