The Zhang Historical Volatility Indicator is a technical analysis tool used to measure the volatility of a financial instrument over a specified period. It provides an accurate measure of the degree of variation in the price of an asset by analyzing its past price movements. The indicator was developed by Yang Zhang in 2000, and it combines elements of the Parkinson and Garman-Klass volatility estimators with additional adjustments to handle opening jumps and drift.
The indicator calculates the standard deviation of an asset's price changes over a set period, typically 10 to 20 days. This value is expressed as a percentage of the asset's current price, indicating the degree of historical price volatility. A higher percentage represents a more volatile asset, while a lower percentage signifies a less volatile one.
Traders and investors use the Zhang Historical Volatility Indicator to: