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 Geometric mean regression analysis		  New Topic  Reply to Topic
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hcholmberg

Sweden
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Posted - 06/11/2006 :  5:03:10 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Is it possible to perform geometric mean regression analysis with Origin?
HC

easwar

USA
1965 Posts
Posted - 06/12/2006 :  1:36:50 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi HC,

This feature is not currently available in Origin, but if one knows the algorithm it could be coded using either scripting or Origin C.

I did a breif search on geometric means regression and came up with this page (amongst many others):
http://www.math.utah.edu/~zobitz/pdf_files/Spring05_teaching/matlab_assignment.pdf
and according to this page, the GMR slope and intercept can be computed simply using the mean of X, Y data and the slope, intercept and correlation coefficient of the Least Square linear fit (that Origin performs). As for error estimates on the GMR paramters, and other things like how to incorporate x error bar if any etc, not sure...

Easwar
OriginLab
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