Talk:Pearson distribution

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Mathematics rating:	B Class	Low Priority	Field: Probability and statistics
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This article is neither complete nor correct. It needs the definition of Pearson's system of distribution and a discussion of Pearson distributions up through type XII. And I suspect that the functional form of the type IV is wrong. Ϙ 21:07, 7 July 2007 (UTC)

I've scrapped it and replaced it with my working draft. It's still obviously incomplete, but less so than before. I think it would be fair to say that only types I through VII form a coherent system. Types VIII through XII were more of an afterthought. --MarkSweep (call me collect) 00:09, 8 July 2007 (UTC)

That is a vast improvement. The extra types seem to be various special cases that he didn't discuss in the first paper. Type VII is the student-t distribution, X the exponential, XI are power laws, and I don't recognize types VIII, IX and XII. I still don't understand why Pearson thought Eq. 1 was the right way to derive probability distributions Ϙ 00:34, 8 July 2007 (UTC)

There seems to be an error in the derivation of type IV. If b2 > 3 (as indicated by the figure, and from the negative sign of the discriminant), how can m := 1/2*b2 > 0.5? Labecks 12:57, 8 October 2007 (UTC)