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colorseq
2012 Nov 27
1
interactions in GAMs
...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 new variable (colorsex) which combines all the level of both
color (2 levels) and sex (2 level), so that I have a new variable with 4
level. In this case I can do:
mod=gam(energy~s(size, *by=colorsex*, k=5) + temperature, ...)
What do you think of this approach?
In this case, should I also include colorsex (or color*s...