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st: RE: ST: delete duplicate observations


From   PEREZ PEREZ JORGE EDUARDO <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: RE: ST: delete duplicate observations
Date   Sat, 12 Sep 2009 19:46:19 +0000

sort id
duplicates drop id, force


This will only work if you want to keep the FIRST observation for each id

_________________________
Jorge Eduardo Pérez Pérez

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Laura Platchkov
Sent: sábado, 12 de septiembre de 2009 01:45 p.m.
To: [email protected]
Subject: st: ST: delete duplicate observations

Dear all,

I have a dataset with 200'000 observations, and a lot of observation have the same ID. I want to keep only 1 observation of each ID, lets say the first one that have this particular ID.

My dataset is like this:

ID  variable Z

1     45.6
1     46.7
1     47.8
1     .
2      .
2
2
3
4
5
5
5
5


An I want to transform the dataset like this:
1      45.6
2
3
4

Does anyone has the magic command for that???

Laura

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