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The VIX is the 30-day expected volatility of the SP500 index, more precisely the square root of a 30-day expected realized variance of the index. It is calculated as a weighted average of out-of-the-money call and put options on the S&P 500:
Performance of VIX (left) compared to past volatility (right) as 30-day volatility predictors, for the period of Jan 1990-Sep 2009. Volatility is measured as the standard deviation of S&P500 one-day returns over a month's period. The blue lines indicate linear regressions, resulting in the correlation coefficients r shown. Note that VIX has ...
The CBOE Volatility Index, or VIX, measures the implied volatility of the S&P 500 over the next 30 days based on market pricing for options. A higher value on this ‘fear gauge’ signals more ...
The VIX is an index run by the Chicago Board Options Exchange, now known as Cboe, that measures the stock market’s expectation for volatility over the next 30 days based on option prices for the ...
Implied Volatility Index was introduced in 1998 and it is a registered trade mark of IVolatility.com. 1998 – Implied Volatility Index measure was introduced for 30 day term for US equity markets; 2000 – Additional IV Index terms were added: 60, 90, 120, 150, 180, 360, 720; 2002 – Coverage of IV Index is expanded to European Markets
Implied volatility can change constantly due to shifts in market conditions, supply and demand for the underlying asset and broader economic events that may change investors’ sentiment.
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