Definition
A fixed look-back that moves with the calendar: the last 7, 30 or 90 days. A rolling window shows how a strategy is doing now rather than across its whole history, so a model that was strong last spring and has cooled off shows it. Each window counts only the picks graded inside it.
Related terms
- Unit — A standardized stake (typically 1–2% of bankroll) used to track results independent of dollar amounts, e.g. +12.5u.
- Return on Investment (ROI) — Net profit in units divided by total units staked, as a percentage. A 5% ROI means 5 units returned for every 100 staked.
- Sample Size — How many graded bets back a record. Small samples are mostly luck — trust records over hundreds of bets.