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From "Karl D. Gierach (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-1373) In LogNormalDistribution.java, it appears shape & scale are reversed/mis-labelled.
Date Thu, 02 Jun 2016 00:27:59 GMT
Karl D. Gierach created MATH-1373:
-------------------------------------

             Summary: 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


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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