Thanks for the replies I received on interactions. They were very
helpful and I think that I understand the model now.
Say we are looking at the interactions of two variables. A colleague
wondered why we don't just fit the possible group combinations as
indicator variables (i.e. 1-1 as a group (baseline), 1-2, 1-3, 1-4,
2-1, 2-2, 2-3, 2-4, etc) and get an OR (I am doing logisitic
regression) for each group combination except 1-1 .
What is the advantage of fitting the conventional model?
Thankyou
Karin
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