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Problems in non-linear fitting [message #52990]

Thu, 15 March 2007 02:04

duxiyu@gmail.com
Messages: 88
Registered: March 2007

Member

I am using the MPFITFUN for curve-fittin.
It is easy and effectual.
But I have some confused points in using it.

Could it give a value which can measure the quality of fiting?
For example, if you do a linear fiting, you can caculate the R^2 to
measure the quality of fiting.
This R maybe is the correlate cofficient between Y and Yfit. (I am not
sure for this. if you know how the R is caculated, please tell me.)
I do not know whether the R^2 can describe the quality of non-linear
fiting.
Becasuse when I select the different starting values of the parameters
to fit, I get the different results, I need a parameter to determine
which result is best.
If it not, I want to find a new parameter which can meet my request.

Best regards,
Du Jian

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[Message index]

		Problems in non-linear fitting By: duxiyu@gmail.com on Thu, 15 March 2007 02:04
		Re: Problems in non-linear fitting By: Craig Markwardt on Thu, 15 March 2007 08:30
		Re: Problems in non-linear fitting By: Vince Hradil on Thu, 15 March 2007 08:25

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