Historical Volatility as a Measure of Return Dispersion
Summary
Historical volatility describes how widely an asset's returns have varied over a chosen period. The document presents standard deviation as the common calculation approach, while noting that it is not the only possible method. A higher reading indicates larger fluctuations and therefore greater uncertainty about price changes over that sample window.
The measure is nondirectional: it does not indicate whether prices are rising or falling, and should not be interpreted as a bullish or bearish signal by itself. It can help characterize changing volatility and risk, but the text gives no formula details, sampling convention, annualization method, or worked example. Results therefore depend on choices such as the return definition and observation period, which are not specified here. Historical volatility summarizes past movement; the document does not claim that it predicts future volatility or price direction.
Key ideas
- Historical volatility summarizes the dispersion of returns over a selected period.
- Standard deviation is a common way to calculate the measure, but alternatives exist.
- A higher value indicates larger observed price fluctuations, not a particular direction.
- The reading depends on calculation and sampling choices that the document does not specify.
- Past volatility alone does not establish future volatility or price direction.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.