Dear all,
I am estimating a difference in difference regression with stata...
and I would like to know what would be the best approach:
I estimate a difference in difference in levels: that is if my output
variable is Y, treated individuals have the dummy D=1 and treatment
period is in time T=2
I run -reg Y T D T#D
and the coefficient on T#D gives me the diff in diff estimates. But if
Y is a count variable... how could I say that Y decreased by X% after
the reform using the same approach?
Should I regress log(Y) instead of Y?
Many thanks for your help
-Jack
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