Re: st: Keeping observations

[n j cox <n.j.cox@durham.ac.uk>]

. sort id, stable
. by id: keep if employ[1] == 2

Patricia Vera Rojas

I have :

id    employ
1       2
2       1
3       2
3       2
4       2
4       1
5       1
5       2
6       1
6       1

where id= subject identification and employ=1 if the person is employed 
and employ=2 if the person
is unemployed.
I want to keep in the data those subjects whose are unemployed in the 
first observation (employ=2)
without losing their second observation if they are observed more than 
once, that is:

id    employ
1       2
3       2
3       2
4       2
4       1

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