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.
Schwab Fundamental U.S. Broad Market ETF (FNDB) had 20-Day Historical Volatility (Parkinson) of 0.0776 for 2026-01-20.
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