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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 weighted average formula is used to calculate the average value of a particular set of numbers with different levels of relevance. The relevance of each number is called its weight. The weights should be represented as a percentage of the total relevancy.Therefore, all weights should be equal to 100%, or 1. The most common formula used to determine an average is the arithmetic mean formula.This formula adds all of the numbers and divides by the amount of numbers.he weights should be represented as a percentage of the total relevancy. Therefore, all weights should be equal to 100%, or 1. The most common formula used to determine an average is the arithmetic mean formula. This formula adds all of the numbers and divides by the amount of numbers.