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st: Keeping groups

From   David Musselwhite <>
Subject   st: Keeping groups
Date   Sun, 25 May 2008 14:58:59 -0400

Dear Listers,

I have a dataset which I've divided into 30000+ groups. The dataset is
quarterly, with observations for each month for each group. What I'm
trying to do is keep those groups in which all cases have the same
value (1) for another variable, called nocell. I'm sure this will be
easy for the advanced users, but I'm stumped, as I'm a new STATA
convert from the world of SAS.

David Musselwhite
Cornell University

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