FA-64872 / Epidemic compartment models / Member archive

SEIR daily symptom-onset incidence: infectious compartment in force · case 02

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

Member previewVariant 2 · 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: fractional latency	`[[4.0, 4.4693, 6.9949, 11.0059, 16.8319, 24.5567, 33.3076], 300.0]`	`[[4.0, 1.3333, 2.5351, 2.7755, 3.3698, 3.9741, 4.6871], 300.0]`	Failed

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