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https://issues.apache.org/jira/browse/MATH-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13914574#comment-13914574
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Gilles commented on MATH-1009:
------------------------------
I think that Bruce is right: "PolynomialCurveFitter" does not override
"getOptimizer()" which the superclass defines to return an instance of
"LevenbergMarquardtOptimizer".
> PolynomialFitter
> ----------------
>
> Key: MATH-1009
> URL: https://issues.apache.org/jira/browse/MATH-1009
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.2
> Environment: All
> Reporter: Konstantin Berlin
> Priority: Minor
> Fix For: 3.3
>
>
> org.apache.commons.math3.fitting.PolynomialFitter
> should be implemented using linear least-squares method like QR decomposition
> solver.
> There are several reasons for this
> 1) Nonlinear methods are much slower
> 2) Linear methods (QR and SVD) are numerically more stable.
> 3) By storing the QR decomposition it is possible to recompute the solution
> for different input data values.
> See
> http://mathworld.wolfram.com/LeastSquaresFittingPolynomial.html
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