FA-12639 / Survey sampling estimators / Member archive

Deduplicating repeated PPS draws changes the estimator · case 04

Deduplicating repeated PPS draws changes the estimator.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

draws are (unit identifier,value,positive draw probability); repeated unit entries have identical value and probability. Return Hansen-Hurwitz population total rounded to eight decimals, or None for no draws.

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
unequal repeat multiplicity	`20.0`	`16`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.