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List:       jakarta-commons-dev
Subject:    [jira] [Commented] (MATH-1206) Cost in least-squares fitting
From:       "Gilles (JIRA)" <jira () apache ! org>
Date:       2015-02-26 18:00:13
Message-ID: JIRA.12777885.1424958922000.24678.1424973613822 () Atlassian ! JIRA
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    [ https://issues.apache.org/jira/browse/MATH-1206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14338808#comment-14338808 \
] 

Gilles commented on MATH-1206:
------------------------------

I also suggest that we add a
{code}
double getReducedChiSquare(int numFitterParameters);
{code}
method to the {{Evaluation}} interface.


> Cost in least-squares fitting
> -----------------------------
> 
> Key: MATH-1206
> URL: https://issues.apache.org/jira/browse/MATH-1206
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.3, 3.4, 3.4.1
> Reporter: Gilles
> Assignee: Gilles
> Fix For: 4.0
> 
> Attachments: MATH-1206.patch, MATH-1206.patch
> 
> 
> In {{org.apache.commons.math4.fitting.leastsquares.AbstractEvaluation}}, the value \
> returned by the "getCost" method is not consistent with the definition of "cost" in \
> a least-squares problem: It is the sum of the squares of the residuals, but the \
> method returns the square-root of that quantity.



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