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st: Left Truncated Survival Data Question


From   mclouser@email.arizona.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: Left Truncated Survival Data Question
Date   Tue, 8 Mar 2005 14:45:04 -0700

I have been trying to figure out how to use STATA to analyze some left truncated
survival data.

The data I am working on has the following variables:  Age at admission to
hospital, time of follow-up in years and if the subject died or was censored. 
I have been reading in the stata manual about the command origin and entry
under stset.  On page 312 of the STATA 8.0 manual on survival analysis it
mentions left truncation.  I am pretty sure that I need to use the entry
command to set the data as left truncated.  If someone could confirm this it
would be great.

Secondly I am wondering if I can plot number at risk as a function of age in
this case and how I would execute that.  I'm having trouble understanding how
to generate number at risk or if it is automatically generated, what STATA
assigns to it as a variable name.

Any assistance is greatly appreciated.

Thanks, Mary Clouser

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