FA-65719 / Ecological population dynamics / Member archive

Two-pass removal abundance estimate: estimator numerator · case 04

Abundance is underestimated and becomes zero when the second pass is empty.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

N = c1^2/(c1-c2), p = (c1-c2)/c1, var = c1^2*c2^2*(c1+c2)/(c1-c2)^4 rounded [2, 4, 2]; [None, None, None] when c1<=c2; None for negative catches.

Why this case matters

Population projections set harvest quotas, conservation status and pest-control timing; a wrong update order, boundary or rate conversion silently changes management advice.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: stream electrofishing	`[42.86, 0.5833, 127.45]`	`[102.86, 0.5833, 127.45]`	Failed

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