Dependent default and recovery: MCMC study of downturn LGD credit risk model

Details Dependent default and recovery: MCMC study of downturn LGD credit risk model Dependent default and recovery: MCMC study of downturn LGD credit risk model

2011-12-25

arxiv.org/abs/1112.5766v1

Economy

Quantitative Finance

Risk Management

Scientific paper

There is empirical evidence that recovery rates tend to go down just when the number of defaults goes up in economic downturns. This has to be taken into account in estimation of the capital against credit risk required by Basel II to cover losses during the adverse economic downturns; the so-called "downturn LGD" requirement. This paper presents estimation of the LGD credit risk model with default and recovery dependent via the latent systematic risk factor using Bayesian inference approach and Markov chain Monte Carlo method. This approach allows joint estimation of all model parameters and latent systematic factor, and all relevant uncertainties. Results using Moody's annual default and recovery rates for corporate bonds for the period 1982-2010 show that the impact of parameter uncertainty on economic capital can be very significant and should be assessed by practitioners.

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