Calculating credit risk capital charges with the one-factor model
Abstract
Even in the simple one-factor credit portfolio model that underlies the Basel II regulatory capital rules coming into force in 2007, the exact contributions to credit value-at-risk can only be calculated with Monte-Carlo simulation or with approximation algorithms that often involve numerical integration. As this may require a lot of computational time, there is a need for approximate analytical formulae. In this note, we develop formulae according to two different approaches: the granularity adjustment approach initiated by M. Gordy and T. Wilde, and a semi-asymptotic approach. The application of the formulae is illustrated with a numerical example. Keywords: One-factor model, capital charge, granularity adjustment, quantile derivative.
Cite
@article{arxiv.cond-mat/0302402,
title = {Calculating credit risk capital charges with the one-factor model},
author = {Susanne Emmer and Dirk Tasche},
journal= {arXiv preprint arXiv:cond-mat/0302402},
year = {2008}
}
Comments
15 pages, LaTeX with hyperref package, final version