FA-74468 / Experiment statistics / Member archive

Group sequential stopping rule: Continuing trials report the next look number · case 03

Monitoring shows one more completed look than actually happened.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Looks beyond len(boundaries) are ignored. At look i: stop for efficacy if |z| >= boundaries[i]; else before the final planned look stop for futility if z < futility[i]; at the final planned look without efficacy return null. If data ends earlier return [continue, last look index or -1]. Return [decision, look index].

Why this case matters

Interim analyses control false positives only if the stopping rule is executed exactly.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
early look uses its own boundary	`["continue", 1]`	`["continue", 0]`	Failed

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