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st: Source for Interaction Term Interpretation


From   "Hixson, Eric" <HIXSONE@ccf.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: Source for Interaction Term Interpretation
Date   Wed, 17 Mar 2004 16:47:42 -0500

I have a multiple logistic model testing the relationship of two variables of interest with mortality.  Both terms remain non-significant predictors until the interaction term is added.  The interaction term is negatively signed, significant and influences the significance of one of the first order terms (results below using _outreg).  No other changes are made to the models.

I wondered if anyone could recommend references to help interpreting the model and deciding what variables to keep.

Thanks,
Eric Hixson

				Model 1	Model 2
Admit Evening		0.298		0.528
				-0.175	(0.029)*
Weekend			-0.128	0.325
				-0.647	-0.335
Weekend X Evening				-1.197
						(0.037)*

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