[R] Setting constraints in the glm package

[David Smith]

Many thanks for the help.

I assumed that I would need to account for the variables in the model, even
though I wish to assign a zero coefficient to them. I've looked at the
offset function, but does this not just assign the value 1 to the variables?
How would I specify a zero coefficient to more than one predictor in the glm
model? Do I do this directly somehow  i.e.
y~I(X1)+offset(X2==0)+offset(X3==0)... ?

David
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