[R] Linear model with one known coordinate

[Philipp Pagel]

> 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 für Genomorientierte Bioinformatik
Technische Universität München
Wissenschaftszentrum Weihenstephan
85350 Freising, Germany
http://mips.gsf.de/staff/pagel