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st: How to drop observations
From
natasha agarwal <[email protected]>
To
[email protected]
Subject
st: How to drop observations
Date
Mon, 14 Nov 2011 17:54:30 +0000
Dear Statalist,
I want to estimate a model only on those firms where the exporting
status switches from non-export to export.So for instance.
Firm Year Export Status
A 2001 0
A 2002 0
A 2003 0
A 2004 1
A 2005 1
B 2001 0
B 2002 0
B 2003 0
In this I want to drop firm B as it does not change its export status.
Moreover, for firm A, I want to keep only observation uptil 2004.
If anybody could help me it would be great.
Thanks,
Natasha
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