FA-65093 / Epidemic compartment models / Member archive

Age-structured force of infection: contact orientation · case 03

Pressure on children uses the contacts adults report making with children.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

lambda[a] = beta*susceptibility[a]*sum_b contacts[a][b]*infected[b]/sizes[b] (groups with zero size skipped); expected new infections susceptible[a]*(1-exp(-lambda[a])); return [lambdas rounded 6, new infections rounded 4, total rounded 4].

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: asymmetric school contacts	`[[0.043571, 0.010952], [11.938, 7.5159], 19.4539]`	`[[0.041429, 0.020952], [11.363, 14.3067], 25.6697]`	Failed

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