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From: Yan on 4 May 2010 14:33
I got different results when running logistic regression using Proc
Logistic with interaction term.

One way, I directly put the cross product term in the model statement
of Proc Logistic; the other way I created an interaction variable in
DATA step. Results are different when I included the missing in the
analysis. One is significant, the other is not. Can't figure out why
this will be different. Not sure how SAS deal with the interaction
term in Proc Logistic.
From: shiling99 on 16 May 2010 16:38
On May 4, 2:33 pm, Yan <zheng...(a)gmail.com> wrote:
> I got different results when running logistic regression using Proc
> Logistic with interaction term.
>
> One way, I directly put the cross product term in the model statement
> of Proc Logistic; the other way I created an interaction variable in
> DATA step. Results are different when I included the missing in the
> analysis. One is significant, the other is not. Can't figure out why
> this will be different. Not sure how SAS deal with the interaction
> term in Proc Logistic.

It should be identical. If you can provide a little detail or with
simulated data, it will be easy for others to "debug" it.
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