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Re: st: Warning - singleton groups detected

From   Nick Cox <>
Subject   Re: st: Warning - singleton groups detected
Date   Tue, 12 Apr 2011 15:17:44 +0100

Chris Parker started a thread earlier today which touches on this. See
the Statalist archives if you get the digest only. Skim other postings
if you get them individually.


On Tue, Apr 12, 2011 at 3:10 PM, vikramfinavker
<> wrote:

> 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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