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st: Survival analysis: excluding patients entering risk set after a specific date
From
"paul o'brien" <[email protected]>
To
statalist <[email protected]>
Subject
st: Survival analysis: excluding patients entering risk set after a specific date
Date
Thu, 25 Nov 2010 08:07:13 +0000
dear all,
i want to exclude from the risk set patients who have a intra-uterine
device inserted after 1st Jan 2007, but continue counting failures
(removals) for earlier insertions to the present.
using before(exp) does not work for me.
stset date, id( patient_id) enter(inout=1) origin(inout=1 time
date+21) failure(inout==2) before(d(1jan2007))
thanks,
paul
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