Hello Statalist members,
I'm applying -sts graph- to a set of survival data, in which study
ends at 10 years. However, the Kaplan Meier plot I create doesn't
reflect people who survived till study's end.
Below are sample data, prepared with
. stset datedied, failure(failed) origin(datedx) scale(30.4375)
id datedx datedied datelost studyend _t
5 01may1992 . . 31oct1997 .
8 01sep1991 01sep1996 . 31oct1997 60
22 01jun1991 . . 31oct1997 .
33 01jan1989 . 01jan1996 31oct1997 .
The following command will not show the subjects who survived till study's end:
. sts graph
Note that _t correctly shows 60 month survival for:
subject #8, who lived 5 years
However, note that _t shows no survival time for:
subjects #5 and #22, who were still alive at study end
subject #33, who lived 7 years.
I don't want to simply replace _t with the date calculation
"datelost-datedx", because _t for those censored subjects will be
lost if I again -stset-.
I also don't want to simply replace datedied with studyend, because
those subjects censored at study end will look like they'd died on
the KM plot.
How is a situation like this handled?
Thank you kindly,
--
Michael McCulloch
Pine Street Foundation
124 Pine St., San Anselmo, CA 94960-2674
Tel: (415) 407-1357
Fax: (415) 485-1065
[email protected]
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