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https://issues.apache.org/jira/browse/MATH-1285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977040#comment-14977040
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Otmar Ertl commented on MATH-1285:
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Thanks for reporting this. I have changed the reference to Wikipedia's article
about Zipf's law. See https://en.wikipedia.org/wiki/Zipf's_law.
3.6: 5f03f0d702574a9c5655778ee28fe3e23d86a9b0
4.0: 8ed2209b1f8e2452d71ef8c3149f3ed3d89d4dfa
> Description API ZipfDistribution
> --------------------------------
>
> Key: MATH-1285
> URL: https://issues.apache.org/jira/browse/MATH-1285
> Project: Commons Math
> Issue Type: Improvement
> Environment: All
> Reporter: Pim van der Hoorn
> Priority: Minor
> Labels: easyfix
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The description of the constructors for the ZipfDistribution class specifies
> an argument of type doule, called exponent. The documentation refers to a
> MathWorld page where the distribution is defined. However, here the exponent
> p, is the exponent of the cdf, not of the pdf (which is then p + 1). After
> running some test I found that the exponent in the constructor is the one for
> the pdf. This can create confusion among users. Therefore I recommend
> specifying in the documentation which exponent is meant.
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