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st: Re: Re: how to keep maximum value


From   "Rodrigo A. Alfaro" <ralfaro76@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Re: how to keep maximum value
Date   Sun, 24 Sep 2006 22:42:24 -0400

An alternative

collapse (max) var1, by(year)

----- Original Message ----- 
From: "Michael Blasnik" <michael.blasnik@verizon.net>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, September 24, 2006 10:01 PM
Subject: st: Re: how to keep maximum value



bysort year (var1): keep if _n==_N

Michael Blasnik

----- Original Message ----- 
From: "FUKUGAWA, N." <nfukugawa@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, September 24, 2006 9:33 PM
Subject: st: how to keep maximum value


> Dear all,
> Suppose we have data as follows,
> 
> year var1
> 1997 14 
> 1997 32 
> 1997 19 
> 1998 18 
> 1998 42 
> 1998 50 
> 1999 3 
> 1999 23 
> 1999 37 
> 
> we want to keep observations by year if var1 is maximum within
> the same year.
> 
> year var1
> 1997 32 
> 1998 50 
> 1999 37 
> 
> How can I do this using stata9?
> Thank you in advance.
> ---
> FUKUGAWA Nobuya, Ph.D.
> nfukugawa@gmail.com

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