Flags instruments that have broken from their cohort — ranks each by where it sits in the percentile distribution of its peer group. The peer-percentile axis resurrected the anomaly read from a near-dead 0.05 to 0.41 (experimental). It replaced the original macro-residual anomaly engine, which was retired after its OLS basket leaked the very divergences it was meant to catch.
A reading in its cohort's far tail means it's the outlier — moving against the group, not against itself. Distinct from Stretched (own history) and Breakout (own regime): this is relative-to-peers.
Primary read of the Anomalies chapter ("What's not behaving like its peers?"). The hybrid variant runs alongside as a second method.
Graded on the Tier-1 regime-test harness — curated macro events × 18-yr backfill × recall@K. Verdict EXPERIMENTAL (gate > 0.50 to ship).