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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.
The VIX is a helpful tool and indicator. It gives a current and accurate measure of where options premium in the S&P 500 index is trading. However, it is very important that we understand that the VIX is not right or wrong in its current or forecast measurement of S&P 500 volatility.