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Re: the problem of PERROR in MPFITFUN [message #53077 is a reply to message #53076]

Thu, 15 March 2007 08:34

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"duxiyu@gmail.com" <duxiyu@gmail.com> writes:
> In my work, independent variable X is time and measured dependent
> variable Y is magnetic field. The instrument do not give the measured
> error.

Adding to what Kuyper said... do you have no uncertainty estimate of
the magnetic field? I would guess that your instrument has been
calibrated, and the calibration information should provide an estimate
of the uncertainties.

The chi^2 value (i.e. BESTNORM) provides a measure of goodness of fit,
*if* you have estimated the measurement uncertainties properly.

OR, *if* the fit is known to be good, then the chi-square provides an
estimate of the measurement uncertainties.

Good luck,
Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: the problem of PERROR in MPFITFUN By: Craig Markwardt on Thu, 15 March 2007 08:36
		Re: the problem of PERROR in MPFITFUN By: Craig Markwardt on Thu, 15 March 2007 08:34
		Re: the problem of PERROR in MPFITFUN By: Vince Hradil on Thu, 15 March 2007 08:31
		Re: the problem of PERROR in MPFITFUN By: James Kuyper on Thu, 15 March 2007 07:44

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