Re: [R] Adding percentage to Pie Charts (was (no subject))

From: Anupam Tyagi <AnupTyagi_at_yahoo.com>
Date: Wed 20 Sep 2006 - 16:48:49 GMT

Greg Snow <Greg.Snow <at> intermountainmail.org> writes:

> Have you read the books by Cleveland?

I do not recall reading Cleveland's book; I have read one by Tufte. You raise some interesting issues there. I agree with some, I could not clearly understand some other things you mention.

I think visual perception is aquired, in part. So if I were presenting data to viewers who took carpentry or other such classes in highschool I may be tempted to use dotcarts.

An interesting experiment: have kids compare pieces of pie or bread-sticks over a dinner, and check how they do. They should not have taken a carpentry class. I use dot-charts, they are useful. Sometimes pie carts are useful too, because people are so used to using and seeing them over a long time. Ofcourse, they can be improved.

Also, it may be possible to put points of a dot-chart on a single straight line, label them with a pointing line, and get better perception. There is poor perception of the horizantal distance, by having to view that extra vertical distance in a dotchart. However, it is useful to have the vertical axis in Lattice plots, but not in stand-alone dot-charts.

Anupam.



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