R help - Aug 2008 - Linear model with one known coordinate

Dear All,
I have a question which seems trivial, but I reached a dead end.
I have a set of points (measurements) and I used lm() to obtain their linear
regression model. From the biological background this line must pass through
a point (100,0). Our dataset is not optimal and it shows a slight deviation
from that coordinate. How can I add the restraint to the model, to go
through that point?

Any help would be appreciated.

Anya Baresic, PhD Student
Research Department of Structural and Molecular Biology
University College London
anya at biochem.ucl.ac.uk
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> I have a set of points (measurements) and I used lm() to obtain their
linear
> regression model. From the biological background this line must pass
through
> a point (100,0). Our dataset is not optimal and it shows a slight deviation
> from that coordinate. How can I add the restraint to the model, to go
> through that point?
You can do that with offset(). There is an example in the manual page
for glm.

cu
	Philipp

-- 
Dr. Philipp Pagel
Lehrstuhl f?r Genomorientierte Bioinformatik
Technische Universit?t M?nchen
Wissenschaftszentrum Weihenstephan
85350 Freising, Germany
http://mips.gsf.de/staff/pagel