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.

The pie chart is easily the worst way to convey information ever developed in the history of data visualization. Sure, there are other more cumbersome ways to articulate data. But none have the ...

Pie charts help people display complex data in a colorful, organized and compact way. Microsoft Word comes with several pie charts that you can fill with data manually. Manual data entry is fine, but ...