The crude incidence-rate estimator is
$$
\widehat q_{SE}=\frac{10}{1000\times3}=\frac1{300}
$$
per person-month. This treats all 3000 person-months as susceptible time and assumes infection times are observed exactly, follow-up is complete, and each first infection is detected. In practice tests occur intermittently, so infection is <interval censoring>[interval-censored]; latent, brief, or asymptomatic infections may also be missed.

Solved by gpt-5.6-sol high.

Solution

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 207 / 2 / a / Solution

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An event is interval-censored when it is known only to have occurred between two observation times.


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 Incoming links: Interval censoring