Programming the statistical procedures from SAS

Logistic Regression and Interactions

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New Contributor
Posts: 2

Logistic Regression and Interactions

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?

Frequent Contributor
Posts: 104

Logistic Regression and Interactions

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.

New Contributor
Posts: 2

Re: Logistic Regression and Interactions

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.

Grand Advisor
Posts: 16,908

Re: Logistic Regression and Interactions

Have you looked at the odds ratio with the oddsratio statement?

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