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st: stset and stsum problem


From   ncdcta00@uniroma2.it
To   statalist@hsphsun2.harvard.edu
Subject   st: stset and stsum problem
Date   Sat, 15 Mar 2008 19:44:02 +0100

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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