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st: re: xtabond 2

From   Kit Baum <>
Subject   st: re: xtabond 2
Date   Fri, 16 Nov 2007 09:43:18 -0500

Bill asked

1. Are 800 observations large enought to run xtabond2?
2. How can I deal with the warnings: relative large instruments than
the observations?

First of all, abdata (the classic dataset used by Arellano-Bond: webuse abdata) has 1031 observations, and it is certainly large enough. What matters more perhaps is the relative size of T and N. The technique is suitable for large N, relatively small T (such as single digits). It will work with larger T, but N should be much larger than T.

To keep from generating 'too many' instruments, use the lags( ) option when specifying gmmstyle() instruments. And read through Roodman's "How to do xtabond2" (you can find it on RePEc, http://

Kit Baum, Boston College Economics and DIW Berlin
An Introduction to Modern Econometrics Using Stata:

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