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RE: st: data suppression in Stata


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: data suppression in Stata
Date   Mon, 2 Sep 2002 15:26:11 +0100

Frank de Libero replied to Chris Wallace
 
>> * Does this do what you want?
>> 
>> drop if Time > Event_Time
>> 

> Since Rajiv wants to suppress data by person, the following 
> should be used:
> 
> bysort Person: drop if Time > Event_Time

Not so. The -bysort Person:- does no harm, but it's superfluous. 
Forget panels, and imagine 

. bysort foreign : drop if mpg > 35 

Whether a car is -foreign- is immaterial to whether 
-mpg- is more than 35. Similarly which -Person- we 
are looking at is immaterial to the -drop-. 

Nick 
n.j.cox@durham.ac.uk 
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