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Posted to issues@commons.apache.org by "Otmar Ertl (JIRA)" <ji...@apache.org> on 2015/10/27 20:49:28 UTC

[jira] [Commented] (MATH-1285) Description API ZipfDistribution

    [ https://issues.apache.org/jira/browse/MATH-1285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977040#comment-14977040 ] 

Otmar Ertl commented on MATH-1285:
----------------------------------

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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