Hi Lars,
Graph it:
plot(pred_leuk)
will show that some of the survival curves do not reach 0.5 before you run out
of data. Thus the median is not estimated and you get NA.
Chris
-Original Message-
From: Lars Bishop [mailto:lars...@gmail.com]
Sent: Thursday, July 10, 2014 6:23 AM
To:
Hi, Lars.
I don't understand well your question. why don't you simply type
pred_leuk
Call: survfit(formula = leuk.cox, newdata = leuk_new)
records n.max n.start events median 0.95LCL 0.95UCL
1 4242 42 30 1 1 23
2 4242 42 30 7
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