You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@commons.apache.org by "Rob Tompkins (JIRA)" <ji...@apache.org> on 2017/04/12 11:09:41 UTC

[jira] [Updated] (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:all-tabpanel ]

Rob Tompkins updated MATH-1373:
-------------------------------
    Fix Version/s: 4.0

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)