FA-63622 / Actuarial life tables / Member archive

Exposure to risk by age band: Actuarial exposure is truncated at the study end · case 02

Deaths near the end of the study get too little exposure.

Member previewVariant 2 · 3 implementations · 14 checks per implementation

Case contract

Input study [s, e) days, age a, method exact|actuarial, records [[birth, entry, exit, died]] with 365-day years. Age band [birth+365a, +365). Observation [max(s,entry,band start), min(e,exit,band end)); a death at exit counts if lo<=exit<min(e, band end). Actuarial exposure extends a counted death to the band end. Return [total exposure days, deaths].

Why this case matters

Life-table arithmetic compounds across ages, so one misplaced index or assumption shifts every downstream value.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
death near study end	`[100, 1]`	`[365, 1]`	Failed

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