Sébastien Brisard created MATH-791:
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Summary: 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: Sébastien Brisard
Assignee: Sébastien 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 this
page, the shape parameter is named alpha and the scale parameter is 1 / beta
(inverse of beta), while in the current implementation, the shape parameter 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 apparently 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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