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 How does Origin calculate standard error?		  New Topic  Reply to Topic
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xlkong1990

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Posted - 10/08/2013 :  11:53:57 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginLab 8.6
Operating System:Win7
I find the following information from OriginLab website:
http://originlab.com/www/helponline/Origin/en/UserGuide/The_Fit_Results.html
From Parameter Standard Errors part, it says Variance-Covariance Matrix C=inv(F'F)*s^2. I want to know how the Origin calculate C when F is singular(hence, F'F is singular) and the inverse of F'F cannot calculate directly. What method Origin has used to deal with this condition?
Thanks

Kathy_Wang

China
159 Posts
Posted - 10/10/2013 :  03:16:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

As I replied in the email, when F is singular, SVD is used while if it is not singular, Gauss-Jordan will be used.

Kathy
Originlab
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