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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.

Whether you are preparing a proposal for a new client or presenting your annual sales forecast, pie charts provide an instant visualization of complex numbers. Microsoft Excel includes a range of ...

Edward Tufte hates pie charts. Edward Tufte is also the only chart theorist normal people have ever heard of. And so yesterday the Internet was gripped with anti-pie fervor. My friend Tom Lee sticks ...

Apple’s Numbers spreadsheet app offers a wide variety of charts to help interpret the data in its tables (as does its Pages word processor). But when you want to turn numbers into pictures, you need ...