Editing Implied volatility (section)

==Volatility instruments==
Volatility instruments are financial instruments that track the value of implied volatility of other derivative securities. For instance, the [[Chicago Board Options Exchange|CBOE]] Volatility Index ([[VIX]]) is calculated from a weighted average of implied volatilities of various options on the [[S&P 500 Index]]. There are also other commonly referenced volatility indices such as the VXN index ([[Nasdaq]] 100 index futures volatility measure), the QQV (QQQ volatility measure), [[IVX]] – Implied Volatility Index (an expected stock volatility over a future period for any of US securities and exchange-traded instruments), as well as options and futures derivatives based directly on these volatility indices themselves.