Hi all,
I have a panel data (firm and year). I create Post indicator for states that adopt certain laws. Specifically, I create Post, which is a dummy that takes a value of one in all observations in which the law is in effect, and zero otherwise. This is a staggered adoption (states adopt the laws in different year).
What is the best way to create this difference in difference regression?
DepVar= Post + controls
or
DepVar = Post + Treatment*Post + Treatment + control variables, Treatment indicates states adopting the laws.
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