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Re: st: survival analysis with time varying covariates
From
"Weichle, Thomas" <[email protected]>
To
<[email protected]>
Subject
Re: st: survival analysis with time varying covariates
Date
Wed, 3 Aug 2011 09:15:43 -0500
Hi Megan,
Assuming you have stset the data with the id option which is required to
use the -stsplit- command:
Suppose you have a dichotomous variable for an event and a count of the
time to this particular event starting from the beginning of the study
follow-up, then you can create a time-varying covariate by splitting the
episode.
* Splitting records at chemo events to treat them as time-varying
covariates
stsplit chemo_tvc, at(0) after(time = dx_to_chemo_day)
replace chemo_tvc = chemo_tvc + 1 if chemo_dx_6mth == 1
See for episode splitting:
http://user.demogr.mpg.de/kreyenfeld/Lehre/2009W_MP301/Materials/lecture
s/Lecture10.pdf
Tom Weichle
Math Statistician
Center for Management of Complex Chronic Care (CMC3)
Hines VA Hospital, Bldg 1, C202
708-202-8387 ext. 24261
[email protected]
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