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st: How to proceed a landmark survival analysis (tests and plots)?

From   Änne Glass <>
To   <>
Subject   st: How to proceed a landmark survival analysis (tests and plots)?
Date   Wed, 26 Oct 2011 11:54:08 +0200

Hello Statalist,

we are interested in doing a landmark survival analysis with Stata(10.1), comparing therapy1 vs therapy2, before and after a landmark (t=24 months). Our data table consists of id, survivalTime, survivalStatus, therapyGroup.

Following your blog at we did 1) -stset- for declaring data to be survival-time data with _st, _d, __t, _t0. (done) 2) -stsplit- to split data into 2 time-span records with the landmark t=24, that means one pre-landmark and one post-landmark. This step modified our data table by adding one line for those ids going over 24 months. (done) 3) -sts graph- command plotted the Kaplan-Meier failure function for the whole time-span (0-102 months) for both treatments. (done, but not desired)

A step-by-step approach would be great, as we are not yet that proficient in Stata.
Many thanks in advance - Aenne.
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