Buchli Loa asks how to test the equality of regression coefficients generated
with two samples, where one sample is a subsample of the other. This is an
example of a test that can be obtained using suest. The structure of what
you have to do is:
regress y xlist, score(F*)
est store Full
regress y xlist if expression, score(R*)
est store Res
suest Full Res
test [Full=Res]
I hope this helps
Jeroen
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