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Re: st: Simultaneous occurance


From   Kyle Hood <kyle.hood@yale.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Simultaneous occurance
Date   Tue, 18 Mar 2008 12:17:19 -0400 (EDT)

If the variables are named x1 and x2, could you not just sum them?

. gen x3 = x1 + x2

Then you get 0 when they are both zero, 1 when they differ, and 2 when they are both 1. If you want to return a 1 when x1 = x2, use

. gen x3 = ( x1 == x2 )

egen group will encode all four possible combinations

. egen x3 = group( x1 x2 )

Kyle



On Tue, 18 Mar 2008, 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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