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A major topic in empirical finance is correlation of default risk. Correlations are the main drivers for credit risk on …
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measured empirically. The study extends reduced form bond valuation models based on rating migration (matrices), by allowing … searching the minimum and maximum possible price, through optimization. The study models bond value of individual issues, as … well as portfolios. The cost of downgrade or default is delineated, by calculating possible future bond or portfolio prices …
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We develop the regime-switching default risk (RSDR) model as a generalization of Merton's default risk (MDR) model. The RSDR model supports an expanded range of asset probability density functions. First, we show using simulation that the RSDR model incorporates sudden changes in asset values...
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With the New Basle Capital Accord banks' capital requirements are determined with risk weights based on internal and external ratings and probabilities of default (PD's). PD's are mostly estimated from historical default rates. In recent working papers the Basle Committee on Banking Supervision...
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We estimate a model of natural default probabilities conditional on credit ratings and macroeconomic drivers. The output is an issuer-specific expected default rate at variable horizons, which can be combined to form an expected default rate for a given portfolio of rated credits. This permits...
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