FA-64889 / Epidemic compartment models / Member archive

SEIR daily symptom-onset incidence: seed compartment · case 04

Population totals exceed the census by exactly the seed count.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Daily forward-Euler SEIR with sigma=1/latent_days and gamma=1/infectious_days; only I transmits (beta*S*I/pop); seeds start in E and are part of pop; return [daily E->I onsets rounded to 4, total population rounded to 4], or None for non-positive durations or population.

Why this case matters

Compartmental epidemic calculations drive outbreak forecasts, vaccine targets and hospital planning; a single wrong flow, rate conversion or boundary silently changes every downstream number.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: influenza-like 2 day latency	`[[5.0, 2.5, 2.75, 3.1197, 3.5386, 4.0094, 4.537, 5.1268], 1010.0]`	`[[5.0, 2.5, 2.735, 3.0948, 3.5019, 3.9584, 4.4687, 5.0378], 1000.0]`	Failed

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