Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 207 / 5 / ii / Solution

At duration seven there are six at risk and two deaths, at duration thirteen there are four at risk and one death, at duration twenty-six there are three at risk and one death, and at duration twenty-seven there are two at risk and one death. The Kaplan–Meier estimator is thereforeThe censoring of D at duration thirty-seven causes no multiplicative drop.