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We present a new model of normal tempered stable (NTS) processes with stochastic correlation for multi-asset option pricing. The model is constructed by extending the constant correlation term in the NTS model to the stochastic correlation making use of the Ornstein-Uhlenbeck process. As the...
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Portfolio risk estimation in volatile markets requires employing fat-tailed models for financial returns combined with copula functions to capture asymmetries in dependence and an appropriate downside risk measure. In this survey, we discuss how these three essential components can be combined...
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In this paper we consider several time-varying volatility and/or heavy-tailed models to explain the dynamics of return … time series and to fit the volatility smile for exchange-traded options where the underlying is the main ‘Borsa Italiana … of the implied volatility for numerous strikes and maturities during the highly volatile period from April 1, 2007 (prior …
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