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st: defining selection criteria


From   "Richard Pitman" <richard.pitman@oxfordoutcomes.com>
To   "Stata list" <statalist@hsphsun2.harvard.edu>
Subject   st: defining selection criteria
Date   Thu, 29 Mar 2007 09:49:26 +0100

I have a dataset like the following

Id	week	class	treatment
1	0	2	a
1	8	3	a
1	12	3	a
2	0	3	b
2	8	3	b
2	12	4	b
3	0	3	a
3	8	3	a
3	12	2	a

I would like to cross tabulate treatment against class at week 12, ~but~
only for those patients in class 3 at week 0. I am not sure how to achieve
the last criteria.

Any suggestions gratefully received.

Richard Pitman

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