A data set that occurs frequently consists of the values or the percentage breakdown of several categories for two time periods. A common way of plotting these data is to use a pair of pie charts.

Pie charts are a way to show data. Pie charts show proportions of a whole. The circle of the pie chart represents the whole. That's a full 360 degrees. Each part, or slice, represents part of the ...

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Editor’s Note: We’ve been looking at inequality quite a bit lately. In the piece ‘Land of the Free, Home of the Poor,’ we used a trio of pie charts broken down into five quintiles to illustrate ...