On Dec 13, 2010, at 8:46 PM, Bastiaan Bergman wrote:
Hello, I want to model my data with the following model: Y1=X1*coef1+X2*coef2 Y2=X1*coef2+X2*coef3 Note: coef2 appears in both lines Xi, Yi is input versus output data respectively How can I do this in R? I got this far: lm(Y1~X1+X2,mydata) now how do I add the second line of the model including the cross dependency?
The usual way would be to extract coef2 from the object returned from the first invocation of lm(...) and use it to calculate an offset term in a second model. It would not have any variance calculated since you are forcing it to be what was returned in the first model. Now, what is it that you are really trying to do with this procedure?
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