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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.
One way is to use the CBOE Volatility Index (VIX). The VIX measures the implied volatility (IV) in the prices of a basket of put and call options on the S&P 500 Index. The VIX is used as a tool to measure investor risk. A high reading on the VIX marks periods of higher stock market volatility.