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Re: st: eliminating unique values


From   "Stefano Costalli" <stefano.costalli@imtlucca.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: eliminating unique values
Date   Fri, 02 May 2008 11:31:52 +0200

You understood perfectly what I meant. 
Thanks Eva, I was stuck on it.

Stefano

-----Original message-----
From: "Eva Poen" eva.poen@gmail.com
Date: Fri, 02 May 2008 10:19:10 +0200
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: eliminating unique values

> 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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