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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