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Re: Curve Fitting [message #66391 is a reply to message #3644]

Wed, 13 May 2009 08:19

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Hi David--

On May 11, 9:47 am, David Fanning <n...@dfanning.com> wrote:
> Folks,
>
> Here is an excellent article on the perils of curve fitting
> that I think an awful lot of IDL programmers would do well
> to read, especially in light of some recent questions on
> the newsgroup:
>
> http://tamino.wordpress.com/2009/05/11/dangerous-curves/

Yep, nice article. The key point is that when doing curve fitting,
the choice of model is crucial to the analysis.

Ultimately, least squares fitting can only answer the question, is
this curve *consistent* with my data or not? The parameter values are
almost secondary. There may be many other curves that are also
consistent with the data. By not considering them, our interpretation
of the results will have a hidden bias.

If possible, it's best to choose a model based on previously known
qualities of the system being studied. [ ...which the article author
did not. ]

Craig

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[Message index]

		Curve Fitting By: Ian E. Sprod on Wed, 08 February 1995 15:57
		Re: curve fitting By: Paul Van Delst[1] on Tue, 04 May 2004 08:28
		Re: curve fitting By: David Fanning on Tue, 04 May 2004 07:08
		Re: curve fitting By: Paul Van Delst[1] on Tue, 04 May 2004 06:59
		Re: curve fitting By: Craig Markwardt on Mon, 03 May 2004 22:38
		Re: curve fitting By: b_gom on Wed, 05 May 2004 13:41
		Re: curve fitting By: jbondurant on Mon, 03 May 2004 11:37
		Re: curve fitting By: David Fanning on Mon, 03 May 2004 05:26
		Re: Curve Fitting By: Craig Markwardt on Wed, 13 May 2009 08:19

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