09-22-2011 04:39 PM
So I'm fairly new to both logistic regression and SAS, so I was a bit stumped when ran a proc logistic and found a significant 2-way interation. The variables in question are "age" (continuous) x "treatment" (dichotomous). Anyone have any suggestions as to what my next step would be in SAS in order to evaluate this interaction?
09-22-2011 04:47 PM
Not sure what your question is:
- Were you not expecting any interaction but there turned out to be? (Why surprised?)
- Are you wanting to understand the strength of the interaction in relation to other factors? (Start with looking at standardized estimates)
In analytics, finding the unexpected sometimes is a good thing. It's a discovery of new knowledge.
09-22-2011 04:59 PM
Interactions in this case were entirely possible. My question was more about what post-hoc analyses I might employ using SAS in order to understand the nature of this particular interaction. Thanks for the replies btw.