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st: About difference in differences estimation

From   "Lynn Lee" <>
To   <>
Subject   st: About difference in differences estimation
Date   Sun, 16 Sep 2012 10:13:54 +0800

Dear all,

When I write "diff var1,t(var2) p(year)" , Stata only give me the difference
in mean value between control and treatment groups in base year and
follow-up year respectively. But what I need is how regressors contribute to
difference in dependent variable. 

reg y1 x1 x2 x3
reg y2 x1 x2 x3
Then, I want to know how impact of x1 or x2 on difference between y1 and y2.
What command I should use? 

Any suggestion is appreciated.

Best Regards,
Lynn Lee

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