They are good to dunk in your coffee for breakfast.

Actually what they do is allow you to make a pie-type display, with multiple
series, so each concentric ring shows the variation in the amounts of the
categories being displayed.

However, pie charts are not particularly good at getting information into
people's heads. People aren't very good at comparing the angles, especially
if there are more than about four wedges in the pie. Because of this pie
charts should be avoided.

Donut charts are even worse, the rings have a bias due to having different
diameters and different surface areas. People's judgment of areas can be
even worse than that of angles, and the combination makes donuts something
to be avoided at all costs.

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
http://PeltierTech.com
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"QuietRanger" wrote in message
...
I just want to know what they are for
--
QuietRanger