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st: psmatch2

From   Patricia Vera Rojas <>
Subject   st: psmatch2
Date   Wed, 31 Aug 2005 07:31:07 +0200 (CEST)


I have used "psmatch2" (Matching Method = neighbor) and
I've got:

"There are observations with identical propensity score
values.The sort order of the data could affect your
results.Make sure that the sort order is random before
calling psmatch2"

What can I do to be sure the ATT shown is correct?


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