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st: Comparing two coefficients

From   Nikolas Asasa <>
Subject   st: Comparing two coefficients
Date   Tue, 14 Apr 2009 09:14:25 -0700 (PDT)

Dear Stat-users, 
Perhaps someone can help? 
I have the following problem:
I estimate two separate instrumental variable models: 
Ln(CONS) = x1 + z2    (1)
Ln(EXP) = x1 + z2,    (2)
z2 – is a variable to be instrumented
Now I would like to compare coefficient of z2 from the first equation to that of a second equation. Could anyone, please advise me on an appropriate test (if any) in Stata? Would suest do the job?
Thank you in advance.


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