FA-63589 / Actuarial life tables / Member archive

Mortality improvement projection: Improvement is applied linearly · case 04

Long projections over-improve mortality.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input q {age: per 100000 at base_year}, aa {age: annual improvement per 10000}, age, year, n, mode static|generational. For k<n: attained age age+k, projection year = year+k (generational) or year (static); q = min(1, q_base*(1-AA)^(year-base)) with negative exponents de-improving. Missing age -> 'missing age <a>'. Return rates rounded to 8.

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
generational projection	`[0.00721755, 0.00796608, 0.00870525, 0.00943776, 0.01016631]`	`[0.00723147, 0.00798761, 0.00873591, 0.00947886, 0.01021888]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.