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Re: CURVEFIT.PRO standard deviations? [message #30659 is a reply to message #30657]

Mon, 13 May 2002 01:32

Ivan Valtchanov
Messages: 8
Registered: April 2002

Junior Member

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?

Bye

--
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Ivan Valtchanov e-mail:ivaltchanov@cea.fr
DSM/DAPNIA/Service d'Astrophysique
CEA/Saclay tel: +33(0)1.69.08.34.92
Orme des Merisiers, bat.709 fax: +33(0)1.69.08.65.77
91191 Gif-sur-Yvette, France
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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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