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Re: CURVEFIT.PRO standard deviations? [message #30656 is a reply to message #30648]

Mon, 13 May 2002 02:12

Ralf Flicker
Messages: 19
Registered: October 2001

Junior Member

Ivan Valtchanov wrote:
>
> Hi there,
>
> Well, this is a known issue because in "What's new in IDL 5.4" there are
> some lines about LMFIT with correct estimation of sigmas:
>
> ..."In IDL versions prior to 5.4 the correction [sqrt(chisq/(n-m)),
> where n is the number of points and m is the number of coefficients] was
> not being applied."
>
> So you have to multiply the sigmas by this correction factor and you'll
> get them right.
>
> I suppose this is the case for CURVEFIT too.
>
> Hope this helps?

Yes, you're absolutely right - I was too engrossed to see your
response until after I'd posted my own..

thanks,
ralf

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[Message index]

		Re: CURVEFIT.PRO standard deviations? By: Ralf Flicker on Mon, 13 May 2002 15:12
		Re: CURVEFIT.PRO standard deviations? By: thompson on Mon, 13 May 2002 10:46
		Re: CURVEFIT.PRO standard deviations? By: Craig Markwardt on Mon, 13 May 2002 09:19
		Re: CURVEFIT.PRO standard deviations? By: Ralf Flicker on Mon, 13 May 2002 02:12
		Re: CURVEFIT.PRO standard deviations? By: Ralf Flicker on Mon, 13 May 2002 02:09
		Re: CURVEFIT.PRO standard deviations? By: Ivan Valtchanov on Mon, 13 May 2002 01:32
		Re: CURVEFIT.PRO standard deviations? By: Andrew Noymer on Sun, 12 May 2002 23:13

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