Historical Volatility (Parkinson) (90-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.

EROCK INC (EROC) had 90-Day Historical Volatility (Parkinson) of 0.9356 for 2015-10-08.

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Figures for 2015-10-08

Volatility Metrics
Historical Volatility (Close-to-Close)	0.9043
Historical Volatility (Parkinson)	0.9356
Implied Volatility (Calls)	--
Implied Volatility (Puts)	--
Implied Volatility (Mean)	--
Put-Call Implied Volatility Ratio	--
Implied Volatility Skew	--
Option Statistics
Put-Call Ratio (Volume)	--
Put-Call Ratio (Open Interest)	1.6275