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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-160) Chi-Square Test for Comparing two binned Data Sets
Date Sat, 11 Aug 2007 15:33:43 GMT

    [ https://issues.apache.org/jira/browse/MATH-160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12519243
] 

Phil Steitz commented on MATH-160:
----------------------------------

Consistent with the move away from the abstract factory pattern that we are making elsewhere
in commons math, we should deprecate TestFactory.  Therefore, I think it is fine to just add
the new interface and implementation class.

> Chi-Square Test for Comparing two binned Data Sets
> --------------------------------------------------
>
>                 Key: MATH-160
>                 URL: https://issues.apache.org/jira/browse/MATH-160
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Matthias Hummel
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: commons-math.patch
>
>
> Current Chi-Square test implementation only supports standard Chi-Square testing with
respect to known distribution. We needed testing for comparison of two sample data sets where
the distribution can be unknown. For this case the Chi-Square test has to be computed in a
different way so that both error contributions (one for each sample data set) are taken into
account. See Press et. al, Numerical Recipes, Second Edition, formula 14.3.2.

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