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From "Karl D. Gierach (JIRA)" <>
Subject [jira] [Commented] (MATH-1373) In, it appears shape & scale are reversed/mis-labelled.
Date Fri, 17 Jun 2016 20:41:05 GMT


Karl D. Gierach commented on MATH-1373:

I will come up with a patch based on github:
Also, it appears the parameters are reversed in getNumericalVariance() as well.

Sound OK?


> In, it appears shape & scale are reversed/mis-labelled.
> ----------------------------------------------------------------------------------
>                 Key: MATH-1373
>                 URL:
>             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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