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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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for the cointegration rank test are also brie y discussed. In our empirical application we use the data from Figuerola … conclusion from the empirical analysis is that, when using the FCVAR model, there is more support for the cointegration vector (1 …-run backwardation, compared to the results from the non-fractional model. Specifically, we reject the hypothesis that the cointegration …
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essential step in testing for (fractional) cointegration in the bivariate case. For the multivariate case, there are several … versions of cointegration, and the version given in Robinson and Yajima (2002) has received much attention. In this definition … integration order. Furthermore, this time series vector is said to be cointegrated if there exists a cointegration in any of the …
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