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2008 Oct 10
1
Coefficients in a polynomial glm with family poisson/binomial
...X^2, differ considerably. The former are correct and the latter are wrong.
This does not occur using lm() or in a glm with family as normal. I conclude that this is due to the link function, predict() having some way of back transforming the data. But if this is so, are the estimated coefficients wortheless in this case?
I need to get accurate coefficients (for use in another model using offset), and have resorted to re-estimating them by running a second polynomial (lm() this time) on the predicted values from predict() of the glm. This is clearly not a nice way of doing things.
Could anyone pleas...