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An ATT request silently averages untreated potential outcomes · case 05

An ATT request silently averages untreated potential outcomes.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Rows [treated,y0,y1] contain both synthetic potential outcomes. target is ATT or ATE; return the target average y1-y0, None for an empty target.

Why this case matters

A deterministic synthetic study model isolates this data-contract defect; outputs alone establish no real-world causal identification.

One recorded failure

Sample boundary fixture

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

Boundary fixtureActualExpectedOutcome
ATT membership25.010Failed

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