Historical Volatility (Parkinson) (180-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.
First Trust Large Cap Core AlphaDEX ETF (FEX) had 180-Day Historical Volatility (Parkinson) of 0.0927 for 2025-12-15.
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