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st: RE: do group identifiers identify the same groups?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: do group identifiers identify the same groups?
Date   Wed, 9 Jul 2008 17:41:57 +0100

In addition to other answers, there is an FAQ on related logic. 

FAQ     . . . . . .  Listing observations in a group that differ on a
variable
        11/01   How do I list observations in a group that differ
                on a variable?
                http://www.stata.com/support/faqs/data/diff.html

Another trick is 

egen both = group(id1 id2) 
egen g1 = group(id1) 
assert both == g1 

Nick
n.j.cox@durham.ac.uk 

Jeph Herrin

I have two group identifiers in my data of 108k
observations. I would like to verify that that
they identify the same groups - there are about
800 groups, which rules out the simple inspection
routes.

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