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 Regarding fitting of non linear curve		  New Topic  Reply to Topic
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saurabhd0911

India
4 Posts
Posted - 07/25/2016 :  08:12:02 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver.8.0 and Service Release (Select Help-->About Origin):
Operating System:Windows 10

Dear Sir/Mam,
I am trying for a non linear curve fitting using a equation for which I got following values related to the fittings:

1. reduced chi-square value: 1.26E-4
2. Adj R2 value: 0.9801

I want to know whether the curve is acceptable.

KenLefebvre

USA
66 Posts
Posted - 07/25/2016 :  09:31:15 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Saurabh,

That depends entirely on the criteria which you are setting for the problem, however that being said, having a reduced chi-square value that small and an R2 value that close to 1 generally indicate the model was a good fit.

Again this depends how precise you'd like that fit to be, so I can only recommend reading some background literature if you are trying to establish the criteria for it yourself.

https://en.wikipedia.org/wiki/Coefficient_of_determination
https://en.wikipedia.org/wiki/Goodness_of_fit

Best regards,

Ken Lefebvre
Technical Service Engineer
OriginLab
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