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

From   Nick Cox <>
Subject   Re: st: Different results using xtabond2 on 32-bit and 64-bit Windows 7 machines
Date   Mon, 12 Dec 2011 11:08:49 +0000

Please also confirm that the version of Stata is exactly the same on
both machines.

Can you confirm that 33 observations are excluded in one instance and
otherwise the same1248 are included? Are there any other observations
in the dataset? Is there anything problematic about the 33? Does
-xtabond2- issue warning messages in either case?

If you don't get a solution to this, I suggest that you contact the
author directly. He may wish to borrow a copy of the dataset.


On Sun, Dec 11, 2011 at 6:27 PM, Kate Ivanova <> wrote:

> Thanks, Richard, but I do have the latest version on both machines, that is,
> xtabond2 2.9.4 23 May 2011 so that does not seem to drive the difference in
> the results.

Richard Williams

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

>>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))
>>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 machines.
> 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
> c:\ado\plus\x\xtabond2.ado
> *! xtabond2 2.9.4 23 May 2011
> *! David Roodman, Center for Global Development, Washington, DC,
> *! Copyright David Roodman 2004-11. May be distributed free.
*   For searches and help try:

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