I'd agree with all Nick's comments. Piecharts are poor because they are
suitable only for very low data-density and because the perception
relies on comparing areas that are proxies for angles. A notably bad
example recently in a newspaper had angles that were clearly not
proportional to the data. I was able to reproduce the pies by adding a
column containing 100, rather than 100-x. Try plotting
20 100 /* for 20%
30 100 /* for 30% etc
Wrote twice to the editor but got no response.
R Allan Reese
Senior statistician, Cefas
The Nothe, Weymouth DT4 8UB
Tel: +44 (0)1305 206614 -direct
Fax: +44 (0)1305 206601
www.cefas.co.uk
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