FA-12605 / Survey sampling estimators / Member archive

Pooling a disproportionate stratified sample changes expansion totals · case 05

Pooling a disproportionate stratified sample changes expansion totals.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Strata are (known population count, nonempty sampled values); zero-population strata may have empty samples. Return None for an unsampled positive stratum; otherwise rounded total.

Why this case matters

A deterministic survey-design model isolates this sampling contract before it is embedded in a larger estimation pipeline.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
disproportionate allocation	`35`	`80`	Failed

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