DEFINITION of 'Historical Volatility  HV'
The realized volatility of a financial instrument over a given time period. Generally, this measure is calculated by determining the average deviation from the average price of a financial instrument in the given time period. Standard deviation is the most common but not the only way to calculate historical volatility.
Also known as "statistical volatility."
INVESTOPEDIA EXPLAINS 'Historical Volatility  HV'
This measure is frequently compared with implied volatility to determine if options prices are over or undervalued. Historical volatility is also used in all types of risk valuations. Stocks with a high historical volatility usually require a higher risk tolerance.
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What is an option's implied volatility and how is it calculated?
Implied volatility is a parameter part of an option pricing model, such as the BlackScholes model, that gives the market ... Read Full Answer >> 
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