You have not given enough information to reproduce your problem, so it
is difficult to say. Most of the time results such as you display will
be due to a data error. It is possible to get a crossing result,
however.
subject 1 2 3 4 5
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Death 10 - -
Dear list,
I am not familiar with survival analysis and I would need your help to
understand a result I have obtained.
I have used the following command line to look at number of events and
probability of survival at the first 5 years:
> su = summary(survfit(Surv(a[, Date], a[, Event]) ~ strata(a
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