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st: stptime person-time


From   Emilie Chary <emilie_chary@yahoo.fr>
To   statalist@hsphsun2.harvard.edu
Subject   st: stptime person-time
Date   Fri, 19 Feb 2010 15:57:55 +0000 (GMT)

Hello,

I am working on survival data. When I use stset and then stptime, my
person-time results are huge numbers. Are they in days or years?  It seems
like I get the right incidence rates if I use per(365000).

Here are the two lines of code I'm using:
stset endfollowup, failure(fail) origin(time mdy(12,31,2002)) enter(time beginfollowup) id(idpatient)
stptime, by(vaccinated) per(365000) at (0 365 731 1096 1461 1826 2196 2557)

If I use per(1000), my rates are too small to be possible. And I need to have
the right number of person-time in years.

Thank you in advance,
Emilie

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