Data Sources & Verification
Public market data
Articles may reference public series from Yahoo Finance, Stooq, and FRED, plus publisher documentation for Bloomberg or Refinitiv fields. A named source does not imply QTJ holds a proprietary terminal dataset. Worked examples discuss point-in-time and survivorship-bias controls rather than claiming CRSP-equivalent data reconstruction to remove survivorship bias.
Higher-frequency data
Higher-frequency articles use stylised data designs unless a reproducible feed extract is linked. Platform or vendor names describe the market-data context and do not claim privileged QTJ access.
Championship verification
Where a trader's track record is referenced (e.g. risk-adjusted competition winner), the audit is cross-referenced against the originating championship's published results:
- World Cup Trading Championships (WCTC) — official published result pages at worldcupchampionships.com. Used for Darren O'Neill's 2025 placements.
- Published audit material — used for O'Neill's 2023 personal record (+178% return) and risk metrics where the originating material is identified.
- Academic literature — cited for established statistical methods and known selection biases.
Why we cross-reference
Self-reported records and independently tracked competition results carry different evidentiary weight. QTJ therefore separates official placements, published audit material, and editorial interpretation instead of treating them as interchangeable.