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st: -reoprob- error: "varlist required"

From   Yevgeniya Savchenko <>
Subject   st: -reoprob- error: "varlist required"
Date   Thu, 7 Jun 2012 14:30:19 -0400

Dear statalist users,

I am running an ordered probit panel regression model with random
effects (reoprob) of health self-assessment variable (health1) on
gender (ahgsex) with 8 time periods and ID as a panel personal
identifier. The panel is balanced, there are 4 categories in health1,
ahgsex is a dummy which is equal to 1 for men. I get an error -
varlist required- (see below).
. reoprob health1 ahgsex, id( ID)
varlist required

I tried renaming the variables, including different independent
variables, but still get the same error. I use Stata 11.
Could someone please advise how I can tackle this problem?

Your help is greatly appreciated.

Yevgeniya Savchenko
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