Pie charts are one of the simplest ways to visualize information. Their structure is based on simple logic: The largest piece of the pie should begin at the top of the circle, and the values should ...

it's better to use a chart that allows easy comparison of the values, such as a column chart, bar chart or pie chart. When you have a large set of discrete data that doesn't fit on a regular chart ...

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.