FA-12610 / Survey sampling estimators / Member archive

Domain filtering silently changes the target denominator · case 05

Domain filtering silently changes the target denominator.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Rows are (value, inverse-inclusion weight, in-domain boolean); domain_size is a known nonnegative population count. Return HT domain total/domain_size, or None when size is zero, rounded to eight decimals.

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
known domain denominator	`20.0`	`2.5`	Failed

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