Thank you for visiting the Colbert County Schools' website. The administrators, faculty and staff of the Colbert County School System take tremendous pride in working to ensure that our children succeed academically and personally.
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 has replaced the older VXO as the preferred volatility index used by the media. VXO was a measure of implied volatility calculated using 30-day S&P 100 index at-the-money options. Statistician Salil Mehta of Statistical Ideas shows the distribution of the VIX.