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st: RE: stset and stsum problem


From   "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: stset and stsum problem
Date   Mon, 17 Mar 2008 08:49:37 +0900

What exactly is the problem?

______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2140
Phone: -61-8-9224-2140
email: kamccaul@meddent.uwa.edu.au
http://myprofile.cos.com/mccaul 
_______________________________________________

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
ncdcta00@uniroma2.it
Sent: Sunday, 16 March 2008 3:44 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: stset and stsum problem

Dear statlist,
I have tried to set my data for a survival analysis, but I have a  
problem when use stset and put all the observations censored.
My dataset is this:
id  firstyearentry yearentry    yearexit    duration canvi
1      3/2001        3/2001       3/2002       12      0
1       3/2001      4/2002          9/2002       17     1
2       8/2002       8/2002         11/2002       3     0
2       8/2002       12/2002        5/2003        9     0
3 .....
...

The command that I use is:
stset dur, f(canvi==1) id(id)
If I put all the observation censored and not with stsum I have this:
  stsum;

          failure _d:  canvi
    analysis time _t:  dur
                  id:  id

          |               incidence       no. of    |------ Survival  
time -----|
          | time at risk     rate        subjects        25%       50%  
       75%
---------+--------------------------------------------------------------
-------
    total |     10661543   .0002694         34301       1025         .  
         .


If I  take only the observation with failure ==1 I have this:

     failure _d:  canvi
    analysis time _t:  dur
                  id:  id

          |               incidence       no. of    |------ Survival  
time -----|
          | time at risk     rate        subjects        25%       50%  
       75%
---------+--------------------------------------------------------------
-------
    total |       960671   .0030687          2951        131       283  
       469

Someone can help me to understand where is the error?
Thanks in advance.
best,
catia



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