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st: Interaction terms in logistic regression using dummy variables


From   Ashwin Ananthakrishnan <[email protected]>
To   [email protected]
Subject   st: Interaction terms in logistic regression using dummy variables
Date   Wed, 20 Jul 2005 14:57:03 -0700 (PDT)

Hi,

I'm having some trouble interpreting the interaction
terms in logistic regression using stata.

My two variables of interest are gender (0-male,
1-female), and age categories (0- 65-69, 1-70-74,
2-75-79, 4-80 and above), and my outcome variable is
anyscreen.
When i type in the command,
xi: logistic anyscreen i.gender*i.income, I get the
following terms
-Igender_1, _Iagecat_1, _Iagecat_2, _Iagecat_3,
_IgenXage_~1,_IgenXage_~2, _IgenXage_~3.

What do teh odds ratios for each of these terms mean -
especially the interaction terms. And how do I test
the significance of these interaction terms.

Thanks,
Ashwin   

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