Journal of Computational Finance
ISSN:
1460-1559 (print)
1755-2850 (online)
Editor-in-chief: Christoph Reisinger
Credit risk contributions under the Vasicek one-factor model: a fast wavelet expansion approximation
Luis Ortiz-Gracia and Josep J. Masdemont
Abstract
ABSTRACT
Measuring the contribution of individual transactions inside the total risk of a credit portfolio is a major issue in financial institutions. Value-at-risk (VaR) contributions and expected shortfall (ES) contributions have become two popular ways of quantifying these risks. However, the usual Monte Carlo approach is known to be a very time-consuming method for computing the risk contributions. In this paper, the authors accurately calculate the ES and decompose the VaR and the ES into a sum of risk contributions from individual obligors representing the marginal impact on the total portfolio risk. They take the Vasicek one-factor model as the model framework.
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