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 Nonlinear curve fitting

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T O P I C    R E V I E W
Qinge Posted - 10/22/2017 : 11:00:41 PM
Hi, everybody!

I have some problem with nonlinear curve fitting

I've insered the equation (y=a+b*[1-exp(-x/c)]+d*[1-exp(-x/e)]+x/f), here only a can be defined. Other parameters have big errors and R-sqare is 0.89

Qinge
1   L A T E S T    R E P L I E S    (Newest First)
Shirley_GZ Posted - 10/23/2017 : 02:42:26 AM
Hi Qinge,

In my opinion, there are many reasons if the fit result is not good.
You can firstly refer to this FAQ page to evaluate the fit result firstly,
http://www.originlab.com/doc/Quick-Help/measure-fitresult
And then, check all possible reasons in this page:
http://www.originlab.com/doc/Origin-Help/The_Reason_Why_Fail_to_Converge

Anyway, you can send us the Fitting Function file and sample opj file with fitting results via tech@originlab.com to let us check the details. Please also tell us Origin version you are using and the serial number in the email.

Thanks,
Shirley
OriginLab

Originlab Technical Service Team

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