In this thesis, it is analyzed how Large Deviations (LD) techniques can be used for practical credit portfolio management. Applications include the internal risk management for a large credit portfolio, or the overall need to meet external requirements imposed by Basel II. For this purpose the thesis provides fast and reliable methods for the computation of Value at Risk (VaR) and Conditional Value at Risk (CVaR) in general factor models using LD. The thesis puts emphasis on the modelling of recovery rates (RR). The presented approaches reach from deterministic to random RRs, depending on the state of the economy. Furthermore, totally random RRs and a Mark-to-Market framework are scrutinized. The applicability of LD is shown and above mentioned risk measures are calculated. For the random RR results are compared to the case of deterministic RR, demonstrating the need of an adequate modelling of RRs. A portfolio optimization is performed and optimal portfolios with regard to either VaR or CVaR under portfolio constraints are derived, showing that LD techniques can outperform Monte Carlo (MC) simulations with regard to computational effort without a significant lack of accuracy.
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In this thesis, it is analyzed how Large Deviations (LD) techniques can be used for practical credit portfolio management. Applications include the internal risk management for a large credit portfolio, or the overall need to meet external requirements imposed by Basel II. For this purpose the thesis provides fast and reliable methods for the computation of Value at Risk (VaR) and Conditional Value at Risk (CVaR) in general factor models using LD. The thesis puts emphasis on the modelling of rec...
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