I'm trying to build a model with an overall smooth function for all
the data, plus an additional smooth function for *some* of the data.
If "ind" is my indicator variable (0 for some x, 1 for others), I
imagined I could write it like this:
gam.obj <- gam(y ~ s(x) + ind*s(x))
but this does not work.
Does mgcv have a way of doing this? If not directly, is there a
reasonable workaround?
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