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Re: [Bug-gsl] parameters error nonlinear fit

From: Brian Gough
Subject: Re: [Bug-gsl] parameters error nonlinear fit
Date: Wed, 15 Feb 2006 17:13:30 +0000

Massimo Pica Ciamarra writes:
 > I guess there is a bug-imprecision in the
 > example relative non linearfit least square fit.
 > In order to get an estimate of the parameter errors,
 > when the reduced chi square is substantially different from 1,
 > modify the code as follows:
 > double ft = sqrt(gsl_blas_dnrm2(s->f)/(n-p));
 > #define FIT(i) gsl_vector_get(s->x, i)
 > #define ERR(i) sqrt(gsl_matrix_get(covar,i,i))*ft
Thanks for the suggestion, I'll add a note in the manual about it.

Brian Gough

Network Theory Ltd,
Publishing Free Software Manuals --- http://www.network-theory.co.uk/

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