Analysis
Survivorship bias in fund data: how big, and how to check
Databases of existing funds answer a question nobody asked — how did the survivors do — and the gap is measured in percentage points.
Analysis: What the Numbers Mean
Analysis coverage from UZU NEWS.
Analysis
How do you detect lookahead bias in someone else's backtest?
A checklist of audit questions — each targeting a specific leak channel — that turns a suspicious track record into a diagnosed one.
Analysis
Why random cross-validation breaks on financial time series
Shuffled folds leak the future into the past — and the leak is large enough to turn noise into apparent skill.
Analysis
Walk-forward validation: what it fixes, what it doesn't
Rolling in-sample and out-of-sample windows add realism to a backtest — and import their own parameter choices worth auditing.