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Historical volatility vs. implied volatility Historical volatility (HV) is a statistical measure of a stock’s price fluctuations over a specific period in the past. It’s calculated using ...
IVX is the abbreviation of Implied Volatility Index and is a popular measure of the implied volatility [1] of each individual stock. [2] IVX represents the cost level of the options for a particular security and comparing to its historical levels one can see whether IVX is high or low and thus whether options are more expensive or cheaper.
Implied volatility, a forward-looking and subjective measure, differs from historical volatility because the latter is calculated from known past returns of a security. To understand where implied volatility stands in terms of the underlying, implied volatility rank is used to understand its implied volatility from a one-year high and low IV.
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The implied volatility surface simultaneously shows both volatility smile and term structure of volatility. Option traders use an implied volatility plot to quickly determine the shape of the implied volatility surface, and to identify any areas where the slope of the plot (and therefore relative implied volatilities) seems out of line.
The net volatility of an option spread trade is the volatility level such that the theoretical value of the spread trade is equal to the spread's market price. In practice, it can be considered the implied volatility of the option spread.
A short butterfly position will make profit if the future volatility is higher than the implied volatility. A short butterfly options strategy consists of the same options as a long butterfly. However now the middle strike option position is a long position and the upper and lower strike option positions are short.
Starting from a constant volatility approach, assume that the derivative's underlying asset price follows a standard model for geometric Brownian motion: = + where is the constant drift (i.e. expected return) of the security price , is the constant volatility, and is a standard Wiener process with zero mean and unit rate of variance.