Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 207 / 4 / a / i

Table of contents
- Solution i

Solution

The risk set at event time

a_{j}

contains individuals still under observation and event-free immediately before

a_{j}

. For group

k

its size is

r_{j}^{(k)} = \sum_{i = 1}^{n} 1 {g_{i} = k,, x_{i} \geq a_{j}} .

The use of

\geq

keeps the individual who experiences the event at

a_{j}

in the risk set just before that event.

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