ARTICLE SYNOPSIS ...The Volatility Index by David C. Stendahl David Stendahl explains the volatility index (VIX), which measures volatility based on the implied values of eight Standard & Poor's 100 (OEX) options from which the weighted volatility index is derived when combined. The volatility index (VIX) is a measurement of the market's volatility. It specifically measures volatility based on the implied values of eight Standard & Poor's 100 (OEX) options that when combined calculate the weighted volatility index. The Chicago Board of Options Exchange (CBOE) has been using this index for five years and has on...