Hi, if 50% survival probability horizontal line in a Kaplan-Meier survival
curve overlap one of the step line between 2 time points t1 and t2, the
survfit() from survival package estimates median survival as t2 (the longest
time point). But I saw some articles (page 23:
http://www.amstat.org/chapters/northeasternillinois/pastevents/presentations/summer05_Ibrahim_J.pdf)
recommend the smallest time t such time S(t)<=0.5.
What is the convention for the definition of median survival?
Thanks
John
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