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Re: st: Source for Interaction Term Interpretation


From   Jim.Seward@sunhealth.org
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Source for Interaction Term Interpretation
Date   Wed, 17 Mar 2004 15:40:51 -0700

how about Applied Logistic Regression by Hosmer and Lemeshow?

Jim Seward


                                                                                                                               
                    "Hixson, Eric"                                                                                             
                    <HIXSONE@ccf.org>                To:     statalist@hsphsun2.harvard.edu                                    
                    Sent by:                         cc:                                                                       
                    owner-statalist@hsphsun2.h       Subject:     st: Source for Interaction Term Interpretation               
                    arvard.edu                                                                                                 
                                                                                                                               
                                                                                                                               
                    03/17/2004 02:47 PM                                                                                        
                    Please respond to                                                                                          
                    statalist                                                                                                  
                                                                                                                               
                                                                                                                               




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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