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 the definition of parameter's error		  New Topic  Reply to Topic
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nomoyang

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Posted - 12/31/2015 :  8:35:28 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
I fit the function y=ax to get the parameter

a = 5.72 +/- 0.03.
reduced chi^2 = 1.03

But I saw some book say 0.03 = (parameter's error)*sqrt(reduced chi^2)
just for conservative.

I don't know if origin use this definition above or I want to know the definition of "parameter's standard error" in origin.

Thank you very much. ^^
Edited by - nomoyang on 01/01/2016 02:07:58 AM

Shirley_GZ

China
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Posted - 01/04/2016 :  02:47:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

In Origin, there is a control in NLFit dialog for this. See the screenshot below:


When there is no weighting, this check box will be checked and grayed by default. In opposite, when weighting exists, this check box can be checked and unchecked for your own needs. More details, please refer to the help page below:
http://www.originlab.com/doc/Quick-Help/Chi-Se-Remain

Thanks,
Shirley

Originlab Technical Service Team
Edited by - Shirley_GZ on 01/04/2016 03:17:52 AM
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