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Tewodaj Mogues <[email protected]> wrote that the 
-pre( ,lagstruct())- option causes -xtabond- to produce different 
results in
Stata 8 and Stata 9.
I suspect that Tewodaj is not using an up-to-date Stata 8 and that the
difference is due to the changes to -xtabond- that were part of the
14may2004 update to Stata 8.
I suggest that Tewodaj type
. update all
in his version of Stata 8.  
Since the 14may2004 update, no changes have been made to -xtabond-.
	- David
	  [email protected]
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