[SciPy-user] optimize.leastsq fit errors?
ransom at physics.mcgill.ca
Sun Apr 18 10:13:11 CDT 2004
This sounds exactly like what I need. I'll take a look.
Thanks a lot,
On Sun, Apr 18, 2004 at 03:35:07AM -0700, Robert Kern wrote:
> 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.
> 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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Scott M. Ransom Address: McGill Univ. Physics Dept.
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