FA-64875 / Epidemic compartment models / Member archive

SEIR daily symptom-onset incidence: infectious compartment in force · case 05

Transmission starts on day 0 although no seed is infectious yet.

Member previewVariant 5 · 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: one-day latency	`[[4.0, 1.568, 2.1652, 2.5891, 3.1033, 3.6889], 200.0]`	`[[4.0, 0.0, 1.568, 1.1666, 1.4758, 1.5459], 200.0]`	Failed

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