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Qinge

China
2 Posts
Posted - 10/22/2017 :  11:00:41 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
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

Shirley_GZ

China
Posts
Posted - 10/23/2017 :  02:42:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
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
Edited by - Shirley_GZ on 10/23/2017 05:09:22 AM
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