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st: Warning - singleton groups detected

From   vikramfinavker <>
Subject   st: Warning - singleton groups detected
Date   Tue, 12 Apr 2011 07:10:53 -0700 (PDT)


When i am running xtivreg2 regression with two endogenous variables i get
this warning. could someone please tell me what does it mean? and how it
affects my regressions results?

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