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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2018/01/21 15:51:00 UTC

[jira] [Commented] (MATH-1373) In LogNormalDistribution.java, it appears shape & scale are reversed/mis-labelled.

    [ https://issues.apache.org/jira/browse/MATH-1373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16333561#comment-16333561 ] 

Gilles commented on MATH-1373:
------------------------------

Discussion should be moved to the issue tracker of the new "Commons Statistics" component (see STATISTICS-2).

> In LogNormalDistribution.java, it appears shape & scale are reversed/mis-labelled.
> ----------------------------------------------------------------------------------
>
>                 Key: MATH-1373
>                 URL: https://issues.apache.org/jira/browse/MATH-1373
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.6.1
>            Reporter: Karl D. Gierach
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: MATH-1373.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> When I compute the logshape and log scale based on the formulas on wikipedia's lognormal distribution page that use empirical mean and variance, I found that the getNumericalMean() method was not returning the empirical mean.
> However, upon just trying to reverse the shape and scale parameters in the constructor proved to fix the problem, and the object then returns the correct empirical mean.



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