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i try to calculate the probabilty to survive a given time by using the
estimated survival curve by kaplan meier.
What is the right way to do that? as far as is see i cannot use the
predict-methods from the survival package?
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The survfit function directly estimates the probability you want, no
predict method is needed. It is similar to quantile(x, 1:9/10), in that
you would not use predict on that either.
As to getting the value at a specific time, use
summary(fit, time=20)
This correctly interpolates the step function when "20" is exactly one
of the event times.
Terry Therneau
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