RE: st: interactions

[Constantine Daskalakis <c_daskalakis@entwhistle.jci.tju.edu>]

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
   Email: c_daskalakis@mail.jci.tju.edu
   Webpage: http://www.kcc.tju.edu/Science/SharedFacilities/Biostatistics

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