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st: Keep first observation in such a dataset?
From
"Peter Miller" <[email protected]>
To
[email protected]
Subject
st: Keep first observation in such a dataset?
Date
Tue, 11 Feb 2014 22:39:04 +0100 (CET)
Hi guys,
this is my dataset:
DATE ID1 ID2 EVENT_DATE
8/13/2007 10147 95574 13aug2007
8/14/2007 10147 13aug2007
8/15/2007 10147 13aug2007
8/16/2007 10147 13aug2007
8/17/2007 10147 75645 13aug2007
8/20/2007 10147 13aug2007
..... ......
I want to keep only the first ID2. In the example, I want to keep 95574 only. Only the one, which is between DATE and EVENT_DATE. I want to drop all following ID2s in the time series. There are many different ID1s, but each ID1 belongs to only one single ID2, namely the one where EVENT_DATE==DATE.
How can I code this?
Thanks
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