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st: dropping observation


From   Stefano Bonini <sbonini@stern.nyu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: dropping observation
Date   Wed, 10 Jun 2009 18:18:12 -0400 (EDT)

Hi
I have a huge panel dataset containing analyst forecasts. Each analyst is associated with an employer. Sometimes analyst change employer. I want to restrict my dataset, dropping the observations of analysts that never change employer. The dataset may look like this

forecast#     analystID   employer ID
1                 1            1
2                 1            1
3                 1            1

1                 2            1
2                 2            1
3                 2            2
4                 2            2

1                 3            3
2                 3            4

In this case I'd nee to drop all observations by analyst 1 because he never changes employer, while keeping those of analysts 2 and 3.

I really cannot figure out the way to do it as visual inspection is just impossible with over 1.2m obs.

Thanks!

Stefano
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