Talk:Anscombe's quartet

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After putting this together, I saw that Anscombe's Quartet is listed under Wikipedia:Requested articles/Mathematics, under Logic / Set Theory. Which surprised me. Is there another Anscombe's Quartet out there ? Chris24359 20:56, 12 March 2007 (UTC)

There was a mention about it at Correlation#Correlation_and_linearity; it now links back to this page. Schutz 08:30, 13 August 2007 (UTC)

[edit] Variances...

The variances of the x and y variables had been miscalculated. Whoever did the first calculation seems to have summed all (x-mean_x)^2, and then divided by 10, instead of N=11. This error seems to have been repeated elsewhere on the internet, but there are webpages (like this one [1]) which give the correct standard deviation/variance.

Could people "refix"ing the values on the page leave a comment here explaining their calculation? Erkcan (talk) 07:10, 18 April 2008 (UTC)

• The x-variances for the 4 datasets are 10,10,10,10. The y-variances are 3.75206280991736, 3.75239008264463, 3.74783636363636, 3.74840826446281. Erkcan (talk) 07:25, 18 April 2008 (UTC)