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st: R: Intervals time


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: R: Intervals time
Date   Tue, 22 Apr 2008 14:38:00 +0200

Dear Alvine,
Please take a look at what follows:
------------------begin example-----------------------
g  begin_2 = date( begin,"dm20y")
format  begin_2%d
g   end_2 = date(  end,"dm20y")
format   end_2%d
g time= end_2- begin_2
g time_0=time if treat==0
g time_1=time if treat==1
-------------------end example------------------------

HTH and Kind Regards,

Carlo


alvine.bissery@chu-lyon.fr wrote:


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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