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st: Simultaneous occurance

From   Olga Lyashevskaya <>
Subject   st: Simultaneous occurance
Date   Tue, 18 Mar 2008 08:55:32 -0700 (PDT)

Dear all,

There are two binary variables in my sample, where 1
is presence and 0 is absence of the particular
characteristic. I want to identify those cases where I
get either both 0's or both 1's

Any suggestions?

Thank you in advance,


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