Question

3. The following are observations for the time (in months) until relapse for 10 individuals in an addiction support group. A + indicates the observation was censored due to exiting the group or the end of the study: 1 1+ 3 45 5 8+ 9+ 11 11 (a) Obtain the Kaplan-Meier estimate of the survival function, S(t), and plot the estimated survival curve b) Obtain the Nelson-Aalen estimate of the survival function, and plot the curve on the same figure as the Kaplan-Meier estimate. Use Efron's Method for the tail correction (c) Estimate the probability that an individual survives 5 months before relapsing using the Kaplan-Meier estimator. (d) Ignoring the censored observations, what would be the empirical estimate for the probability in part c)? Which estimate is more accurate?

Answer 1

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