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st: AW: coefficients treatreg


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: coefficients treatreg
Date   Wed, 25 Nov 2009 13:09:45 +0100

<> 


They are interpreted just as in normal linear regression. "Lambda" is
defined in "methods and formulas" as the product of sigma and rho:

***
webuse labor, clear
generate wc = 0
replace wc = 1 if we > 12
treatreg ww wa cit, treat(wc=wmed wfed)
di "lambda: " e(rho)*e(sigma)
***

The se derives from the delta method...

HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von "Elisabeth
Müller"
Gesendet: Mittwoch, 25. November 2009 12:30
An: statalist@hsphsun2.harvard.edu
Betreff: st: coefficients treatreg

Hi,

another question concerning treatreg. How do I interpret the coefficients?
E.g.:

wage is the dependent variable
city 

education is the treatment variable
age is in the treatment equation

wage 

city       0.3
education  1.2

education
age        0.05

lambda     2.6

Suppose they are all significant. And what does the lambda in treatreg
really show?  

Thanks
E
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