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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

quant-research market-microstructure anomalies reproducibility duckdb apple-silicon

Python 61.4% JavaScript 28.7% CSS 8.6% Shell 0.7% Makefile 0.5%

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1---2project: anomaly-atlas3document: expG_cost_frontier/README4author: Simon-Pierre Boucher5contact: contact@spboucher.ai6data_source: hfmarketdata.io7created: 2026-08-128status: draft9---1011# expG_cost_frontier1213Cost frontier: transaction-cost sweep, where each surviving net effect crosses zero1415Status: **completed 2026-08-12** — median breakeven kappa*=0.0067; 1 marginal survivor at 0.25x half-spread (CKX 1day, skeptical prior); zero intraday survivors at kappa=1. The three-layer doctrine closes.16