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st: Competing Hazards with Multiple-Record-per-Subject Data


From   Alexander Gelber <gelber@fas.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Competing Hazards with Multiple-Record-per-Subject Data
Date   Fri, 15 Sep 2006 16:58:35 -0400 (EDT)

In earlier Statalist posts, May Boggess of Statacorp explained how to estimate a competing hazard model using Lunn and McNeil's methods A and B. There seems to be a problem, however, with implementing Lunn and McNeil's Method B when using multiple-record-per-subject data.

The problem is that to implement Lunn and McNeil Method B, you need to duplicate each subject's record twice (in the case of two competing hazards). In the case of multiple-record-per-subject data, when using the stset command to stset the data, you need to specify the ID variable using id(idname), where "idname" is the name of the ID variable. But then Stata gives you an error message, because each ID has two records attached to it at every instant, and the stset command with multiple-record-per-subject data only works correctly when there is only one record for each id-time combination.

For example, in my case, the time variable is "month," the failure variable is "status," and the id variable is "id," and here is what happens when I try to stset my data:

. stset month, failure(status) id(id)

id: id
failure event: status != 0 & status < .
obs. time interval: (month[_n-1], month]
exit on or before: failure

------------------------------------------------------------------------------
2000 total obs.
2000 multiple records at same instant PROBABLE ERROR
(month[_n-1]==month)
------------------------------------------------------------------------------
0 obs. remaining, representing
0 subjects
0 failures in single failure-per-subject data
0 total analysis time at risk, at risk from t = 0
earliest observed entry t = .
last observed exit t = .

Does anyone know how to address this problem? Any help would be much appreciated.

Alex

--
Alexander Gelber
Ph.D. Candidate
Harvard University Department of Economics
Littauer Center
Cambridge, MA 02138
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