Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 207 / 4 / b

Table of contents
- Solution b

Solution

Without censoring, every

v_{i} = 1

and

E T_{i} = 1/ λ

. Therefore

\frac{E \sum _{i} v _{i}}{E \sum _{i} x _{i}} = \frac{n}{n / λ} = λ .

This is events divided by total person-time at risk.

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