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Jan 29

Friday reading list 29/01/2010

Posted by abiao at 11:54 | Others | Comments(0) | Reads(2804)
1, On the Heston Model with Stochastic Interest Rates, "We discuss the Heston [Heston-1993] model with stochastic interest rates driven by Hull-White [Hull,White-1996] (HW) or Cox-Ingersoll-Ross [Cox, et al.-1985] (CIR) processes. A so-called volatility compensator is defined which guarantees that the Heston hybrid model with a non-zero correlation between the equity and interest rate processes is properly defined. Two different approximations of the hybrid models are presented in order to obtain the characteristic functions. These approximations admit pricing basic derivative products with Fourier techniques [Carr,Madan-1999; Fang,Oosterlee-2008], and can therefore be used for fast calibration of the hybrid model. The effect of the approximations on the instantaneous correlations and the influence of the correlation between stock and interest rate on the implied volatilities are also discussed." http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1382902

2, Dynamic Copula Modelling for Value at Risk, "By using copulas, we can separate the marginal distributions from the dependence structure and estimate portfolio Value-at-Risk, assuming for the risk factors a multivariate distribution that can be different from the conditional normal one. Moreover, we consider marginal functions able to model higher moments than the second, as in the normal. This enables us to better understand why VaR estimates are too aggressive or too conservative. We apply this methodology to estimate the 95%, 99% VaR by using Monte-Carlo simulation, for portfolios made of the SP500 stock index, the Dax Index and the Nikkei225 Index. We use the initial part of the sample to estimate the models, and the the remaining part to compare the out-of-sample performances of the different approaches, using various back-testing techniques." http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1542608


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