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Date: Fri, 25 May 2012 01:02:42 +0000 (UTC)
From: =?utf-8?Q?S=C3=A9bastien_Brisard_=28JIRA=29?= <jira@apache.org>
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Subject: [jira] [Commented] (MATH-791) GammaDistribution.getAlpha() and
 getBeta() are confusing
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    [ https://issues.apache.org/jira/browse/MATH-791?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D132828=
83#comment-13282883 ]=20

S=C3=A9bastien Brisard commented on MATH-791:
----------------------------------------

New accessors have been defined in {{r1342404}}.
               =20
> GammaDistribution.getAlpha() and getBeta() are confusing
> --------------------------------------------------------
>
>                 Key: MATH-791
>                 URL: https://issues.apache.org/jira/browse/MATH-791
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.1, 4.0
>            Reporter: S=C3=A9bastien Brisard
>            Assignee: S=C3=A9bastien Brisard
>            Priority: Minor
>
> As discussed on the mailing list
> {quote}
> Some methods in {{o.a.c.m3.distribution.GammaDistribution}} are ill-named=
. Indeed, the class javadoc explicitly refers to the Wikipedia page. In thi=
s page, the shape parameter is named alpha and the scale parameter is 1 / b=
eta
> (inverse of beta), while in the current implementation, the shape paramet=
er is named alpha, and the scale parameter is named beta (not 1 / beta !!!)=
. This might be confusing. Looking at other web pages, I see there is appar=
ently no consensus on the naming of shape and scale
> parameters. The problem lies with the accessors, which are
> {{double getAlpha()}}
> {{double getBeta()}}
> I think these accessors can lead to confusion. I would therefore propose =
to deprecate them, and replace them with
> {{double getShape()}}
> {{double getScale()}}
> {quote}

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