Rich Ulrich wrote
> I'm not sure what Bruce was saying about coefficients.
I'll try again. Here are the B values for the two variables of interest and
their interaction:
B(drink) = 0.566 = ln(HR) for drink when ses = 0 (i.e., reference category)
B(ses) = 0.393 = ln(HR) for ses when drink = 0 (i.e., reference category)
B(interaction) = -0.094
Therefore:
0.566 -0.094 = 0.472 = ln(HR) for drink when ses = 1
0.393 -0.094 = 0.299 = ln(HR) for ses when drink = 1
The interaction term tests the differences between 0.566 and 0.472 (for
drink) and between 0.393 and 0.299 (for ses).
And of course, those ln(HR) values are adjusted for the other variables in
the model.
Is this clearer?
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Bruce Weaver
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