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Paul84

Ukraine
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Posted - 07/15/2006 :  10:43:58 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin 7.0
Operating System: Win XP

NLSF reports the reduced chi^2 value, not chi^2. How can I manage to find the common chi^2 value? For example, Origin give me the reduced khi^2= 1.17, while in the article I revised it pointed out 19,5 (20 degrees of freedom).

Thanks.

zachary_origin

China
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Posted - 07/15/2006 :  11:40:48 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can take a look at this article.


http://www.originlab.com/www/support/resultstech.aspx?ID=710&language=English
What is the difference between Chi-Square and reduced Chi-Square?

Zachary
OriginLab GZ Office
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Mike Buess

USA
3037 Posts
Posted - 07/15/2006 :  11:48:43 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
These read-only NLSF properties are available...

nlsf.chisqr = reduced chi^2
nlsf.dof = degrees of freedom
nlsf.ssr = sum of squares ("common" chi^2)

They are related through the expression nlsf.chisqr = nlsf.ssr/nlsf.dof.

Mike Buess
Origin WebRing Member

Edited by - Mike Buess on 07/15/2006 11:51:06 AM
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Paul84

Ukraine
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Posted - 07/15/2006 :  4:59:06 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you again.
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