Richard Williams replied:
>(1) If both of these achieved significance here, how on Earth do you
>decide whether or not to include an interactive term in the model?
None of the analyses presented so far have said anything about
interaction terms; they've only addressed whether residual variation
differs across groups, and the answer seems to be no. If you now
want to test interaction terms involving race, go ahead; and plain
old -logit- will probably be adequate for your needs.
Considering the inclusion of an interaction term, such as race in our -union- dataset, naturally follows such estimation, since we're in the business of comparing logit coefficients across groups. I have to say this is an absolute minefield. Thanks for your helpful comments with regards my other follow-up query.
Clive Nicholas
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