Other Cboe Volatility Strategy Benchmarks.
The Cboe S&P Implied Correlation Indexes measure changes in the relative premium between index options and single-stock options. A single stock's volatility level is driven by factors that are different from what drives the volatility of an Index (which is a basket of stocks). The implied volatility of a single-stock option simply reflects the market's expectation of the future volatility. CBOE S&P ® Implied Correlation Index Option prices reflect the risk of a stock or stock index. The level of risk conveyed by option prices is often referred to as implied volatility. The implied volatility of a single-stock option simply reflects the market’s expectation of the future volatility of that stock’s price returns. Similarly, the implied volatility of an index option.
They found no evidence that hydroxycitric acid, the active ingredient in weight loss products made from garcinia cambogia, produced significant weight loss. The American Journal of Clinical Nutrition in 2004 published a systematic review of meta-analyses and clinical trials on dietary supplements for weight loss by complementary medicine researchers at the Universities of Exeter and Plymouth.
None of the over-the-counter weight loss aids worked, including garcinia cambogia. Late in 2010 the peer-reviewed Journal of Obesity published a meta-analysis of studies testing the garcinia as a weight loss aid. Of the 23 trials they identified, 12 were methodologically sound enough to include in their analysis.
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Yet, there are times when index option implied volatility moves and there is no corresponding shift in implied volatilities of options on those components.