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Re: st: Dropping/Keeping observations


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Dropping/Keeping observations
Date   Sat, 22 Apr 2006 10:25:24 -0400

This approach will also drop the multiple observations for all of the other farmerIDs. Why not just:

bysort farmerID: drop if _N==1

Michael Blasnik
michael.blasnik@verizon.net


----- Original Message ----- "Maarten buis" <maartenbuis@yahoo.co.uk> wrote:
<snip>

*---------begin example------------
sysuse auto, clear
replace rep78 = 10 in 10 /*create a unique value in rep78*/
sort rep78
list rep78 in 1/10
by rep78: keep if _n==_N & _N>1 & rep78 <.
list rep78
*----------end example--------------

--- Gauri Khanna <gwkhanna@hotmail.com> wrote:
I would like to KEEP those plots/observations
where farmerID appears more than once. Hence, I would like to DROP those
observations which have only one farmerID. Any tips?
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