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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