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st: Using -stsplit- by calendar date


From   "Wagner, Joseph" <[email protected]>
To   "STATAList" <[email protected]>
Subject   st: Using -stsplit- by calendar date
Date   Fri, 3 Dec 2004 15:56:27 -0500

I have survival data on persons with HIV.  I wish to -stsplit- that data
using calendar dates that represent different time periods: time prior
to availability of antiretroviral therapy (before 1990), monotherapy
(1990-1993), combined therapy (1993-1995), and HAART (after 1995).  I
have date of infection (origin), age of infection (agehiv), commencement
of therapy (rx) and date of AIDS (end).  I want to split the data so I
can compare the hazards of AIDS at different calendar periods which
correspond to the therapies available at that time.  I'm looking at a
population level and not individual level.

I can't seem to figure out from either the manual or "An Introduction to
Survival Analysis Using Stata" how use calendar dates.  Has anyone done
something similar or have suggestions?

 

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