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Alex Rivera
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I am using GAM to model time trends in a logistic regression. Yet I would like to extract the the fitted spline from it to add it to another model, that cannot be fitted in GAM or GAMM. Thus I have 2 questions: How can I fit a smoother over time so that I force one knot to be at a particular location while letting the model to find the other knots? How can I extract the matrix from the fitted GAM so that I can use it in as an impute for a different model? The types of models I am running are to the following form: gam <- gam(mortality.under.2~ maternal_age_c+ I(maternal_age_c^2)+ s(birth_year,by=wealth2) + wealth2 + sex + residence + maternal_educ + birth_order, data=colombia2, family="binomial") I've read the extensive documentation for the GAM but I am not sure still. Any suggestion is really appreciated.
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