[SciPy-user] optimize.leastsq fit errors?

Gary Ruben gazzar at email.com
Sun Apr 18 08:17:49 CDT 2004


Hi Robert,
I seem to remember you offered this for integration into scipy a while back and it was put on the backburner for some reason. Licensing or something? If my memory is correct, I'd just like to say to the scipy overlords that I think it would be nice to see it integrated.
Gary

----- Original Message -----
From: Robert Kern <rkern at ucsd.edu>
Date: Sun, 18 Apr 2004 03:35:07 -0700
To: SciPy Users List <scipy-user at scipy.net>
Subject: Re: [SciPy-user] optimize.leastsq fit errors?

> Scott Ransom wrote:
> > Hi all,
> > 
> > Is it possible (or does anyone have any add-on functions available) to get 
> > error estimates on the fit parameters using optimize.leastq?  (or 
> > alternatively, the resulting covariance matrix from the fit?)
> 
> If your problem is nonlinear, you can try my bindings to ODRPACK. It's 
> main purpose for existence is to do orthogonal distance regression 
> (errors in both input and output variables), but it can do ordinary 
> least squares just fine. Just a quick note: the standard errors that are 
> reported are scaled by the reduced chi-square value as is sometimes 
> recommended. The full covariance matrix, however, is unscaled.
> 
> http://starship.python.net/crew/kernr/source/odr-0.6.tar.gz
> 
> > Thanks,
> > 
> > Scott
> 
> -- 
> Robert Kern
> rkern at ucsd.edu
> 
> "In the fields of hell where the grass grows high
>   Are the graves of dreams allowed to die."
>    -- Richard Harter
> 
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