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From | Christopher Baum <kit.baum@bc.edu> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | re:st: R: RE: Quick doubt about the 2-way clustering option used in |
Date | Mon, 10 Jan 2011 08:48:35 -0500 |
<> I didn't explain right, sorry me. The problem is the second stage regression. I am using -ivreg2-for the GMM estimation and in the first-stage F-stat is not missing like this: . ivreg2 y t p c d (x w = h l m n o ) if sampleCM==1, gmm2s endog (x w) cluster (id deal ) 2-Step GMM estimation --------------------- Estimates efficient for arbitrary heteroskedasticity and clustering on id and deal Statistics robust to heteroskedasticity and clustering on id and deal Number of clusters (id) = 2903 Number of obs = 8194 Number of clusters (deal) = 6512 F( 51, 2902) = 1.90 Prob > F = 0.0001 Total (centered) SS = 84.6613152 Centered R2 = -0.3689 Total (uncentered) SS = 85.85567541 Uncentered R2 = -0.3499 Residual SS = 115.8950279 Root MSE = .1189 All the tests show that my regressors are not endogenous and that my instruments are valid. And so, I back to my OLS regression results that had produced good estimations (and unbiased too). You can use ivreg2 to estimate OLS models with 2-way clustering. Just remove the parens and put in x,w as exogenous variables, and drop the excluded instruments. 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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/