Hi, there,

I have 5 datasets. I would like to choose a basis spline with same knots in
GAM function in order to obtain same basis function for 5 datasets.
Moreover, the basis spline is used to for an interaction of two covarites.

I used "cr" in one covariate, but it can only smooth w.r.t 1 covariate. Can
anyone give me some suggestion about how to choose a proper smoothing spline
(bs='?') and knots for two covariates?

Thanks a lot.

Lee

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