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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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