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Re: st: defining selection criteria


From   Philip Ryan <philip.ryan@adelaide.edu.au>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: defining selection criteria
Date   Thu, 29 Mar 2007 18:47:14 +0930

. reshape wide class , i(id) j(week)
(note: j = 0 8 12)

Data                               long   ->   wide
-----------------------------------------------------------------------------
Number of obs.                        9   ->       3
Number of variables                   4   ->       5
j variable (3 values)              week   ->   (dropped)
xij variables:
                                  class   ->   class0 class8 class12
-----------------------------------------------------------------------------

. li

     +-------------------------------------------+
     | id   class0   class8   class12   treatm~t |
     |-------------------------------------------|
  1. |  1        2        3         3          a |
  2. |  2        3        3         4          b |
  3. |  3        3        3         2          a |
     +-------------------------------------------+

. tab treat class12 if class0==3

           |       12 class
 treatment |         2          4 |     Total
-----------+----------------------+----------
         a |         1          0 |         1
         b |         0          1 |         1
-----------+----------------------+----------
     Total |         1          1 |         2

Phil



Quoting Richard Pitman <richard.pitman@oxfordoutcomes.com>:

> 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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>


-- 
Philip Ryan
Associate Professor
Discipline of Public Health

Director, Data Management and Analysis Centre
Associate Dean (IT)
Faculty of Health Sciences

University of Adelaide
5005 South Australia
AUSTRALIA
CRICOS Provider Number 00123M
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