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Journal ArticleDOI

Asymmetrical Frequency Curves

Karl Pearson
- 01 Oct 1893 - 
- Vol. 48, Iss: 1252, pp 615-616
TLDR
In this article, a generalized form of the probability curve which fits with a great degree of accuracy such curves, and propose to discuss it at length shortly, has been obtained, although not with the completeness of the referred to continuous curve.
Abstract
SOME six years ago (September 1, 1887) Dr. Venn wrote to you pointing out the asymmetrical character of certain frequency curves occurring in physical and biological measurements. I have recently obtained a generalized form of the probability curve which fits with a great degree of accuracy such curves, and propose to discuss it at length shortly. Meanwhile I wish to point out that an asymmetrical point binomial may be readily fitted to such curves, although not with the completeness of the above referred to continuous curve. Let n be the number of events in a group, p the probability for single event, and q that against it; let c be the horizontal space selected as the basis of each rectangle forming the point binomial, and let a be the total area. Then we have the following diagram given by the point system:

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