Why a backtest on today's index is not evidence
Survivorship and restatement: the two errors that flatter a backtest, and the data layer that removes them.
Short pieces on how quantitative evidence is built and where it goes wrong. Written for advisers and compliance officers, not for quants.
Survivorship and restatement: the two errors that flatter a backtest, and the data layer that removes them.
The publication rule, the three tests behind it, and why a factor that fails is still reported.
Policies describe what should happen; the examiner wants evidence of what did. What quantitative evidence can and cannot supply.
Essays are general research and commentary. They describe method and practice; they are not legal or compliance advice and not tailored to any firm. Standard disclosure applies.