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

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2026 iii Paper 207 2
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a
The crude incidence-rate estimator is
q​SE​=1000×310​=3001​
(1)
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-censored; latent, brief, or asymptomatic infections may also be missed.

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