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Re: RE: st: RE: RE: difference between robust and cluster option

From   Christopher Baum <>
To   "" <>
Subject   Re: RE: st: RE: RE: difference between robust and cluster option
Date   Tue, 20 Jul 2010 07:16:05 -0400

On Jul 20, 2010, at 2:33 AM, Jing wrote:

> Based on some expert's recommendation, I used "xtivreg2, cluster (firm
> year)" to cluster the standard errors both on firm and time. the results
> show that all my regressors are automatically included as instrumental
> variables. Could you please advise me that whether I need to define IV
> when run "xtivreg2, cluster (firm year)"?

This has nothing to do with the cluster() option (which you can see if you leave it out). xtivreg2 estimates IV models. A special case of that is standard fixed-effects models, in which all RHS variables serve as their own instruments (as they do in OLS). If you're using xtivreg2 in this context, it will automatically list them as instruments, but that is just semantic.


Kit Baum   |   Boston College Economics & DIW Berlin   |
                              An Introduction to Stata Programming  |
   An Introduction to Modern Econometrics Using Stata  |

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