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Re: st: Simultaneous occurance


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Simultaneous occurance
Date   Tue, 18 Mar 2008 11:59:08 -0400

use egen newvar=rowtotal(var1 var2)

newvar will be 0 if both are 0 (or both missing)
newvar will be 2 if both are 1

Rich

Olga Lyashevskaya wrote:
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,
Olga
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