This pie needs more raisins!

This pie needs more raisins!

For a long time now I've been explaining why pie charts are a bad visualisation. I've been complaining when they get used. Even worse, sometimes they are fake 3-D (where the 3rd dimension is not a new fact, just there to make it 'pretty'). Today I was in a presentation on data visualisation and, unsolicited by me I swear, the presenter brought up this fact, using this example below to demonstrate.

Most people, if they just saw the 3 pie charts (independently), would say the numbers were roughly equal. They are not.

Worse, imagine if someone is doing a time series (last quarter, this quarter, next quarter), you cannot compare. Use a bar, a stacked-bar, or a line.

In "Save the pies for dessert" there are more examples and a more in-depth view on why.

As for the raisins? Yes, they belong in pies, and particularly, inĀ butter-tarts.

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