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st: Question about interactions


From   K Jensen <k.x.jensen@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Question about interactions
Date   Mon, 4 Mar 2013 14:48:10 +0000

I am fitting two four-point scales as predictors in a logistic
regression and am interested in looking at the interaction between the
two.

If I fit variable1##variable2 I get odds ratios for the following:
variable1
	2
	3
	4
variable2
	2
	3
	4
variable1#
variable2
2	2
2	3
2	4
3	2
3	3
3	4
4	2
4	3
4	4

I obviously don't understand this because it doesn't include cells
1-2, 1-3, 1-4, 2-1, 3-1 or 4-1. Can someone explain this?

Thankyou
Karin
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