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RE: st: interactions

From   Constantine Daskalakis <>
Subject   RE: st: interactions
Date   Thu, 26 Jun 2003 13:16:14 -0400

At 01:02 PM 6/26/03, David E Moore wrote:
Let me say at the outset that I applaud any conscientious effort to examine the
plausibility of nonlinear and/or nonadditive models. Notwithstanding that, my
answer to R. Allen Reese's question, "Do cont*cont interactions make sense?" is
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.
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.

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Constantine Daskalakis, ScD
Assistant Professor,
Biostatistics Section, Thomas Jefferson University,
125 S. 9th St. #402, Philadelphia, PA 19107
Tel: 215-955-5695
Fax: 215-503-3804

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