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.
To calculate the EV for a single discreet random variable, you must multiply the value of the variable by the probability of that value occurring. Take, for example, a normal six-sided die. Once you roll the die, it has an equal one-sixth chance of landing on one, two, three, four, five or six.