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st: AW: re: Method for first stage, in xtivreg


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: re: Method for first stage, in xtivreg
Date   Wed, 24 Feb 2010 09:12:41 +0100

<> 

So Kit, can you provide the code to replicate the first stage here?



*************
webuse nlswork, clear
xtivreg ln_w age c.age#c.age not_smsa  /* 
*/ 2.race (tenure = union birth south),  /* 
*/ re first
*************



HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Kit Baum
Gesendet: Mittwoch, 24. Februar 2010 01:03
An: statalist@hsphsun2.harvard.edu
Betreff: st: re: Method for first stage, in xtivreg

<>	
Hans said

And get the first stage results. That is fine, but I would like to  
know how it estimates the first stage. I tried to replicate the first  
stage with OLS, RE, BE, FE etc... I cannot get the same results? I  
wonder why?

The discussion of Methods and Formulas in the [XT] xtivreg manual  
entry, for each method, seems perfectly clear. For instance, for  
method FE, after demeaning the within estimator is a two-stage least- 
squares regression of \ytilde on \Ztilde with instruments \Xtilde.  
The FSRs are thus regressions of each \Ztilde on all of the \Xtilde.  
In their notation Z = Y + X1, where Y are included endogenous and X1  
are included exogenous. X = X1 + X2 where X2 are excluded exogenous.  
All straightforward IV setup.

Kit

Kit Baum   |   Boston College Economics & DIW Berlin   |
http://ideas.repec.org/e/pba1.html
                              An Introduction to Stata Programming  |
http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |
http://www.stata-press.com/books/imeus.html


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