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st: recognizing patterns within two columns of data


From   Dalhia <ggs_da@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: recognizing patterns within two columns of data
Date   Wed, 6 Jul 2011 07:12:54 -0700 (PDT)

Hello,

I would like some advice on how to do the following. Here is how the data looks:

compA holderA 
compB holderA 
compC holderL 
compD holderH
compA holderB
compB holderB
compC holderB

Above, there was more than one instance where compA and compB had the same holder. In a large database, how do I identify instances where a set of comps appear repeatedly with the same holders?

Thanks. I appreciate any advice.
best
Dalhia Mani
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