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st: Intervals time


From   alvine.bissery@chu-lyon.fr
To   statalist@hsphsun2.harvard.edu
Subject   st: Intervals time
Date   Tue, 22 Apr 2008 10:49:03 +0200

Dear all,

My data deals with subjects who receive 1, 2 or more treatements over time.
We want to know how many time they spent with 1 treatment, 2 treatments, 3
treatments , ...

Data are as follows:

id	   begin	      end	   treat
1	04 Apr 2006	  06 Apr 2006	1
1	05 Apr 2006	  09 Apr 2006	0
1	08 Apr 2006	  12 Apr 2006	1
2	15 May 2006	  16 May 2006	1
2	16 May 2006	  24 May 2006	1
2	16 May 2006	  17 May 2006	1 

How can I calculate time spent with 1 treat for id=1, time spent with 2 treat
for id=1, ...

Maybe with after data has been stset ? 

Thank you for help !

Alvine Bissery

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