Hi all,

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:

1) 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?

2) 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.

Thanks,

Antonio Pedro

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