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st: ST: delete duplicate observations


From   Laura Platchkov <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: ST: delete duplicate observations
Date   Sat, 12 Sep 2009 19:44:39 +0100

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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