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Re: st: Different results using xtabond2 on 32-bit and 64-bit Windows 7 machines

From   Richard Williams <>
Subject   Re: st: Different results using xtabond2 on 32-bit and 64-bit Windows 7 machines
Date   Sun, 11 Dec 2011 01:53:56 -0500

At 12:41 AM 12/11/2011, Kate Ivanova wrote:
Hi Statalist Users,

I am puzzled by the fact that I get different results using exactly the same
command on two different machines: one has a 32-bit Windows 7 and the other
one has a 64-bit Windows 7.

The command is as follows:
xi: xtabond2 depvar l.depvar x1 x2 x3 i.Year, gmm(l.depvar, lag(1 1)) iv(x1
x2 x3 i.Year, eq(diff)) robust h(2) orthogonal nolevel twostep

It seems the difference in the results comes from the fact that Stata uses a
different number of observations on the two machines: 1281 obs (114 groups)
on the machine with 32-bit version and 1248 obs (113 groups) on the machine
with 64-bit version while the data I am using are exactly the same on both

I think the first thing I would do is make sure I have the same version of xtabond2 on both machines. On mine I get

. which xtabond2
*! xtabond2 2.9.4 23 May 2011
*! David Roodman, Center for Global Development, Washington, DC,
*! Copyright David Roodman 2004-11. May be distributed free.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu

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