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No. Nor a vertical axis. The main measure is the angular one - although a secondary measure can be introduced by changing the size of the pie. For example a small pie for when the total was small and a larger pie for when the total was large. However, this is often misleading since it is not always made clear whether the radius or the area is proportional to the total. It should be the area but people are not very good at judging differences in circular areas.

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14y ago

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