Raberto, Marco; Scalas, Enrico; Cuniberti, Gianaurelio; … - EconWPA - 2004
We study the volatility of the MIB30–stock–index high–frequency data from November 28, 1994 through September 15, 1995 …. Our aim is to empirically characterize the volatility random walk in the framework of continuous–time finance. To this end …, we compute the index volatility by means of the log–return standard deviation. We choose an hourly time window in order …