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Re: st: Simultaneous occurance


From   Svend Juul <SJ@SOCI.AU.DK>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Simultaneous occurance
Date   Tue, 18 Mar 2008 17:11:28 +0100

Olga wrote:
 
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
 
======================================================
 
If the two binary variables are -a- and -b- :
 
   generate x=a+b
 
When x is 0, both are 0. When x is 2, both are 1.
 
Svend
 
________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:   +45 8942 6090 
Phone, home:   +45 8693 7796 
Fax:           +45 8613 1580 
E-mail:        sj@soci.au.dk 
_________________________________________________________ 


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