st: Re: Keeping the Earliest Observations on Each Leg

["Michael Blasnik" <michael.blasnik@verizon.net>]

bysort id lleg (date): keep if _n==1

note: any ties on date will be rboken arbitrarily

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- 
From: "Raphael Fraser" <raphael.fraser@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, June 12, 2006 7:11 PM
Subject: st: Keeping the Earliest Observations on Each Leg



> I  am interested in keeping the earliest observations on each leg
> where  left leg is denoted (lleg=1) and right leg (lleg=0). Can anyone
> assist?
>
>      id         date   lleg
>       46   22aug1993      0
>       46   28sep1993      1
>       46   28sep1993      1
<snip>> 
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