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Date: Fri, 4 May 2012 12:56:48 +0000 (UTC)
From: "Gilles (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
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Subject: [jira] [Updated] (MATH-784) Javadoc of
 AbstractLeastSquaresOptimizer.guessParametersErrors() is too vague
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     [ https://issues.apache.org/jira/browse/MATH-784?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles updated MATH-784:
------------------------

    Attachment: montecarlo_params.eps

"montecarlo_params.eps" is the plot of a Monte-Carlo run _on the parameters=
_, i.e. generating sets of parameters, and recording which (plotted in gree=
n) have a chi-square lower than "1 + chi2_b", where "chi2_b" is the chi-squ=
are of the optimal solution (plotted in red).

               =20
> Javadoc of AbstractLeastSquaresOptimizer.guessParametersErrors() is too v=
ague
> -------------------------------------------------------------------------=
----
>
>                 Key: MATH-784
>                 URL: https://issues.apache.org/jira/browse/MATH-784
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: S=C3=A9bastien Brisard
>            Assignee: S=C3=A9bastien Brisard
>              Labels: javadoc, optimization
>             Fix For: 3.1
>
>         Attachments: AbstractLeastSquaresOptimizerTestValidation.java, OU=
T.10, OUT.100, RandomStraightLinePointGenerator.java, StraightLineProblem.j=
ava, SyntheticData.java, SyntheticDataLinear.java, montecarlo_params.eps
>
>
> This bug report follows a recent discussion available [here|http://mail-a=
rchives.apache.org/mod_mbox/commons-dev/201204.mbox/%3C20120418122114.GB320=
74%40dusk.harfang.homelinux.org%3E]. It is now recognized that the values r=
eturned by {{guessParametersErrors()}} are in fact known as (asymptotic) st=
andard errors. The javadoc should be made more explicit. Besides, the value=
s returned by this method should be tested. The reference datasets from [NI=
ST|http://www.itl.nist.gov/div898/strd/] are to be used.

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