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st: RE: Testing for program effectiveness with heckman


From   "Shehzad Ali" <sia500@york.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Testing for program effectiveness with heckman
Date   Thu, 29 May 2008 19:32:15 +0100

If I understand correctly, you just need to run the model once (either the
first or second one you mentioned). I would maybe explore - treatreg -
command. Have a look at Andrew Jones' 'Applied Econometrics for Health
Economists'. 

Shehzad


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Riemer, Richard A
CIV DMDC
Sent: 29 May 2008 19:13
To: statalist@hsphsun2.harvard.edu
Subject: st: Testing for program effectiveness with heckman

I want to use heckman on a program evaluation of the effectiveness of
test preparation behavior on aptitude scores (afqt).  Would I have to
run heckman twice; once for test-prep (YesPrep) and once for
non-test-prep (NoPrep) and then compare confidence intervals on the
constant term (afqt _cons) to determine if there were a significant
treatment effect on afqt scores?  On the other hand, is there a direct
way to test for a treatment effect, such as taking the output from
heckman and running it through another procedure?  Are there any good
references for this question or examples in the literature where stata
was used to test for program effectiveness.

heckman afqt iv1 iv2 iv3, select(YesPrep=iv1 iv2 iv3) 
heckman afqt iv1 iv2 iv3, select(NoPrep =iv1 iv2 iv3)

Rich Riemer

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