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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1373) In LogNormalDistribution.java, it appears shape & scale are reversed/mis-labelled.
Date Wed, 08 Jun 2016 23:07:21 GMT

    [ https://issues.apache.org/jira/browse/MATH-1373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321625#comment-15321625
] 

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

Since there are many tests for this class, I wonder what the problem is.
Is it a documentation bug?

Would you provide a patch that would fix the issue?


> 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
>   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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