Historical Volatility (Parkinson) (20-Day)
Historical Volatility (Parkinson): The past volatility of the security over the selected time frame, calculated using the high and low prices on each trading day.
Quadratic Interest Rate Volatility and Inflation Hedge ETF (IVOL) had 20-Day Historical Volatility (Parkinson) of 0.0430 for 2026-01-20.
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