Talk:Pie chart

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I believe that Florence Nightingale invented this type of chart for her work in epidemiology, can someone confirm this and add the appropriate info? Thanks. --Jimaginator 13:15, Feb 25, 2005 (UTC)

Stephen Fry said so on a recent broadcast of QI - I was just coming to add it and you had done so already! -- ALoan (Talk) 10:58, 20 November 2005 (UTC)

[edit] Shouldn't there be a note about the scientific aversion to pie charts?

I came here searching for a discussion about of how Pie Charts should be avoided because they really skew data. I remember my statistics professor going off on how they should never be used if you want to be taken seriously - but do not remember the reasons why. The external link was helpful - but I would have expected more information on this page. Unfortunately, I'm not really qualified to give such information - so I difer to others.

--Ryan Gardner 22:29, 25 August 2006 (UTC)

I'm not qualified either, but I've read about this recently – I just cannot remember where. The problem is that people are bad at judging relative proportions when looking at pie charts, making bar charts more suitable when the intention is to indicate absolute amounts rather than general trends.   — Lee J Haywood 07:31, 26 August 2006 (UTC)
Ah, there's an external link at the end of the article that leads to a warning – that's the one I read.   — Lee J Haywood 08:43, 26 August 2006 (UTC)
I will add this to my to-do list. Yes, this should be avoided. Comparisons between graphs are a mess. --Chrispounds 03:53, 28 September 2006 (UTC)
done. your comments are welcome. --Chrispounds 00:01, 29 October 2006 (UTC)
The image looks good and I don't see any mistakes in the text. Thanks.   — Lee J Haywood 08:20, 29 October 2006 (UTC)
The comparison illustration makes it quite clear. Thanks for adding this. --Ryan Gardner 23:23, 7 December 2006 (UTC)

[edit] scaling of different pie charts?

I removed the following from the article because it isn't explained well enough to understand. If someone knows why different pie charts should be scaled to each other feel free to fix and add it back. It was tacked onto the end of the example section.

Two (or more) pie charts comparing similar data can be created by ensuring that the are drawn to the same scale, using the following formula:

(radius of b)² / number of data in b = (radius of a)² / number of data in a

-Crunchy Numbers 23:04, 18 September 2006 (UTC)

[edit] these pictures are not polar area diagrams

for an example see some of the links in the story or http://flickr.com/photos/ffranchi/286785424/in/pool-16135094@N00/ 74.12.186.60 15:43, 27 November 2006 (UTC)

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