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This paper revisits the fractional co-integrating relationship between ex-ante implied volatility and ex-post realized volatility. Previous studies on stock index options have found biases and inefficiencies in implied volatility as a forecast of future volatility. It is argued that the concept...
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functional represents the limiting distribution for cointegration tests with stationary exogenous regressors, but also for … cointegration tests based on a non-Gaussian likelihood. The approximation is accurate, fast, and easy to use in comparison to both …
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