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why do xtabond and xtabond2 produce different results?

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Dear Statalisters,

I was trying to use the Stata command xtabond2 to replicate the results from xtabond. But I got different results although the difference is small. anyone have a clue? really appreciated!

Below is the syntax i used:

xtabond z_score, nocons lags(1) maxldep(3) vce(robust)

xtabond2 z_score L.z_score, gmmstyle(z_score, laglimits(2 4)) robust noleveleq

Are the above two syntaxes supposed to give the same results? I also attached the data for the two syntaxes.

Anyone have a clue? Many thanks!

Jian Zhang

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