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st: How to drop observations

From   natasha agarwal <>
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.

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