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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