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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (MATH-377) weight versus sigma in AbstractLeastSquares
Date Wed, 23 Mar 2011 20:09:07 GMT

     [ https://issues.apache.org/jira/browse/MATH-377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe closed MATH-377.
------------------------------


Closing issue as it was included in version 2.2, which has been released

> weight versus sigma in AbstractLeastSquares
> -------------------------------------------
>
>                 Key: MATH-377
>                 URL: https://issues.apache.org/jira/browse/MATH-377
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1
>            Reporter: Dimitri Pourbaix
>            Assignee: Dimitri Pourbaix
>             Fix For: 2.2
>
>         Attachments: Math377fix.diff
>
>   Original Estimate: 1m
>  Remaining Estimate: 1m
>
> In AbstractLeastSquares, residualsWeights contains the WEIGHTS assigned to each observation.
 In the method getRMS(), these weights are multiplicative as they should. unlike in getChiSquare()
where it appears at the denominator!   If the weight is really the weight of the observation,
it should multiply the square of the residual even in the computation of the chi2.
>  Once corrected, getRMS() can even reduce
>  public double getRMS() {return Math.sqrt(getChiSquare()/rows);}

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