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by | Dec 22, 2013 | Publications. VIX is a measure of expected volatility calculated as 100 times the square root of the expected 30-day variance (var) of the S&P 500 rate of return. The variance is annualized and VIX expresses volatility in percentage points.
Update: On October 6th, 2014 the CBOE changed the calculation method for the VIX to include SPX weekly options, the old VIX calculation is still being reported using the VIXMO (VIX Month Only) ticker. The new calculation uses the VIX ticker. For more on the new calculation see âCalculating the New VIXâ.