David,
I think that the colorsex approach is the right one, and colorsex should
initially be included as a main effect, because the smooths are centred
for factor by variables (see e.g. ?gam.models). Whether you then choose
to drop this main effect, as it appears to be non-significant, is a
m
Hi all,
I wonder if it's possible to include a double interaction in a GAM formula.
Example:
If I do this:
mod=gam(energy~s(size, *by=color, by=sex*, k=5) + temperature, ...)
I get the interaction betwen size*color and size*sex.
But I need size*color*sex, being size a smoother.
I've created a n
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