When is a "Pie Chart" acceptable to use?
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In all seriousness tho I teach that if you have fewer than 5 categories, pref 2-3, and you need to very quickly show a vast difference between parts of a whole, with no careful discernment needed between slices, pie is ok.
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Yes -- I've heard that before. 2-4 seems to be ideal. Much higher and it's hard (at least for me) to get a feel for scale of difference and numbers in the dozens makes for a completely unusable pie chart.