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Re: st: Identifying unique values within duplicate IDs


From   Rebecca Sacks <rsacks@uoregon.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Identifying unique values within duplicate IDs
Date   Wed, 27 Mar 2013 14:08:36 -0700

Thank you guys! This worked famously. 

-R

On Mar 27, 2013, at 2:04 PM, Rebecca Pope wrote:

> I would just add to Jeph's suggestion:
> bys ID (PHQ9) : gen byte tagged=(PHQ[1]!=PHQ[_N])*(_n==1)
> 
> This modification will only tag the first observation on an ID that
> meets the condition of interest (PHQ 9 score changes). Then you can
> just -list- the IDs.
> 
> -list ID if tagged, noobs clean-
> 
> Since you have a large dataset, you might want to -tab- the tagged
> variable first and make sure that the list of duplicates whose scores
> change isn't too long. If it will be, consider just saving it to a
> file rather than just having it in the results window.
> 
> Regards,
> Rebecca
> 
> 
> On Wed, Mar 27, 2013 at 3:45 PM, Jeph Herrin <stata@spandrel.net> wrote:
>> 
>> 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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