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 Correlation Matrix with the NLFIT Tool		  New Topic  Reply to Topic
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fabif

Germany
12 Posts
Posted - 04/16/2014 :  09:25:25 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 8G SR6
Operating System: Windows 7

I fitted measurement values with a non linear function using 4 free parameters with the NLFIT Method. Can anyone tell me the calculation procedure of the correlation matrix within the NLFIT analysis? Which correlation method is normally used (Pearson, Kendall, Spearman)? To my knowledge the Pearson Method is only valid for linear function. Does a possibility exist to change the automatic calculation procedure of the correlation matrix?

Thank you!

Fabian Fischer

JessieWoo

China
46 Posts
Posted - 04/17/2014 :  03:42:36 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Fabian,

Please refer to the link below for the calculation progress:
http://www.originlab.com/doc/Origin-Help/NLFit-Algorithm#Parameter_Standard_Errors

Best Regards,
Jessie
OriginLab Corp.
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fabif

Germany
12 Posts
Posted - 04/28/2014 :  09:36:18 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Jessie,

thanks for the answer and the link. But a documentation about the calculation of the correlation matrix for nonlinear fittings is missing.

Best regrads,
Fabian
Edited by - fabif on 04/28/2014 09:37:04 AM
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