I want to do this model using mgcv

caco1.gam<-gam(caco1$Pa~s(caco1$T10)+s(caco1$S10)+s(caco1$C10), data=caco1)
But I want to indicate the degrees of freedom of each term, how I have to do
it?


Then, I saw that always the results refered to positive interactions, there
are not negative ones?

Thank you,

Dacha

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