Rogers-Satchell Estimator

Rogers-Satchell Estimator plots drift-independent realized volatility: each bar contributes ln(H/C)·ln(H/O) + ln(L/C)·ln(L/O), a term that prices two-sided movement inside the bar; a candle running open-to-close in a straight line scores zero. The clean build of the Rogers-Satchell estimator averages the term over a 20-bar window, annualizes at 252 bars per year, and adds workflow: a close-to-close drift diagnostic, percentile-ranked alerts, and a dashboard.

How to Trade the Rogers-Satchell Estimator?

• Read the spread: a persistent gap between the close-to-close comparison and the Rogers-Satchell line shows how much of the reading is drift or gaps rather than two-sided movement.
• Compression: the percentile rank crossing under 20 marks quiet two-sided conditions that often precede range expansion, and because drift cancels, a market can read compressed while still grinding one way.
• Expansion: the rank crossing above 80 flags an expanded regime, a sizing input, not a directional call.

Rogers-Satchell Estimator Settings

• Window Length (default 20): bars the per-bar variance is averaged over; four log relations per bar stabilize short windows.
• Annualize (default enabled) and Bars Per Year (default 252): scaling to annualized volatility; match the constant when comparing tools.
• Close-to-Close Comparison (default enabled): the drift-sensitive baseline on identical settings.
• Percentile Lookback (default 100) with High Percentile (default 80) and Low Percentile (default 20): the rank window and alert thresholds.
• Show Percentile Levels (default disabled): dotted levels at the two thresholds.
• Show Dashboard (default enabled) with Position (default Top Right) and Size (default Small); Style inputs set colors and the Gradient Fill (default enabled).

Frequently Asked Questions

When should I use Yang-Zhang instead?

Why does a strong trend day read as quiet?

What do the percentile thresholds add?