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st: help with margins syntax

From   "Sergio I Prada" <>
Subject   st: help with margins syntax
Date   Wed, 4 Nov 2009 15:31:47 -0500 (EST)

Sorry, here a correction on the code

x is binary and it is the variable of interest in a causal model

tobit y x a b, ll(0)
predict phi, pr(0,.)
summ phi if x==1
scalar define scale = _result(3)
gen effect = _b[x]*scale


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