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Fay replicate shrinkage understates variance · case 03
Fay replicate shrinkage understates variance.
Case contract
replicates are nonempty estimates; rho lies in [0,1). Return Fay BRR variance using the supplied full estimate as center, 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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| half shrinkage | 1.0 | 4 | Failed |
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