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Re: st: eliminating unique values


From   "Eva Poen" <eva.poen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: eliminating unique values
Date   Fri, 2 May 2008 10:19:10 +0100

008/5/2 Stefano  Costalli <stefano.costalli@imtlucca.it>:
> Dear statalisters,
>
>  I have a variable with about 25.000 observations and many unique values. I need to drop the unique values, but I can't browse the whole data set to search for each unique value individually.

I'm not quite I understand. Do you have one variable X in your data,
and within X there are some duplicates, and you want to drop
everything that is unique? In this case you can either use

duplicates tag X, gen(tag)
drop if tag==0

or, equivalently,
bysort X: gen drop = _N
drop if drop==1

Eva
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