Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 207 / 6 / b / ii / Solution

In the Kaplan-Meier estimator, replace the ordinary risk set at event time $t$ byThe product-limit factor remains $1-d_j/|R(t_j)|$, but only individuals who have entered and not yet exited contribute to its denominator.

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