FA-12628 / Survey sampling estimators / Member archive

Secondary records inflate survey variance degrees of freedom · case 03

Secondary records inflate survey variance degrees of freedom.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Rows are (stratum, PSU label) for noncertainty strata; labels are unique only within a stratum. Return sum_h(number of distinct sampled PSUs_h - 1), with empty input zero.

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
secondary records repeated	`2`	`1`	Failed

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