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Re: st: Re: dummy variable with overlapping if conditions


From   "Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: dummy variable with overlapping if conditions
Date   Wed, 27 Sep 2006 03:38:35 +0100 (BST)

Kit Baum wrote:

> It is useful to note that a binary variable of this sort is the
> intersection of the sets defined by each dummy. Intersection of sets
> in binary arithmetic is done by multiplying, or with the AND operator
> (&). The union of sets -- true if either is true -- is done with the
> OR operator (|). Stata does not contain an exclusive OR operator
> (XOR), but one can readily be fashioned by adding the dummies:
>
> gen xor12 = cond(dum1+dum2==1, 1, 0)

Thanks a lot for this - I'll try this out as well.

CLIVE NICHOLAS        |t: 0(044)7903 397793
Politics              |e: clive.nicholas@ncl.ac.uk
Newcastle University  |http://www.ncl.ac.uk/geps

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