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.
Author
Karim Al-Rashid
Karim Al-Rashid tracks company results and property markets, with a habit of looking past the loudest number in the room.
Articles by Karim Al-Rashid
Investing
What does factor investing actually measure?
A factor is a return pattern defined by a sorting procedure — and the procedure, not the story, is what gets tested.