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st: Nested zip

From   Kris Anderson <>
Subject   st: Nested zip
Date   Tue, 06 Dec 2011 09:13:18 -0800


I am trying to model a count variable (lifetime use of drugs) nested in schools. Given it's distribution, a zip model would be ideal (lots of zeros). However, it seems Stata will run an xtmepoisson but not zip. Does anyone know why?

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