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Re: st: Identifying unique values within duplicate IDs


From   Jeph Herrin <stata@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Identifying unique values within duplicate IDs
Date   Wed, 27 Mar 2013 16:45:36 -0400

try

 bys ID (PHQ9) : gen byte tagged=PHQ[1]!=PHQ[_N]

cheers,
Jeph


On 3/27/2013 4:33 PM, Rebecca M Sacks wrote:
Hi all!
I'm dealing with a large dataset that had some errors occur when data were being recorded. Although each ID should only
have one record, most of them have two. Anyway, I'm trying to get a list of IDs where the ID variable is a duplicate but
the values for a second variable (PHQ9 score) are different within the duplicate ID. Any advice would be greatly
appreciated.

Thanks,
Rebecca Sacks
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