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Systematic discovery & rigorous validation of statistical anomalies in open HF market data (hfmarketdata.io) — pre-registered, artifact-null-driven, fully reproducible. Live atlas: www.anomaly-atlas.io

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# project: anomaly-atlas document: expH_oos_stability/README author: Simon-Pierre Boucher contact: contact@spboucher.ai data_source: hfmarketdata.io created: 2026-08-12 status: draft

# expH_oos_stability

Out-of-sample stability: once-touched holdout and sub-period evaluation of survivors

Status: completed 2026-08-12 — validation split opened once: negative finding replicates (0 net survivors at kappa=1), CKX fails robustness, ES->SPY does not replicate, daily reversal was crisis-regime. First atlas entries issued.