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RE: st: interactions
At 01:02 PM 6/26/03, David E Moore wrote:
Let me say at the outset that I applaud any conscientious effort to
I think the question has things backwards. The point of the interactions is
that they allow us to relax model assumptions (notably, that of
additivity). As such, they indeed make much sense -- they actually allow us
to fit a more flexible model.
plausibility of nonlinear and/or nonadditive models. Notwithstanding that, my
answer to R. Allen Reese's question, "Do cont*cont interactions make
still yes. If it's always a leap of faith to have a linear additive
model, then perhaps one might want to think twice about creating
interaction terms that assume linear relationships.
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