Asset correlations in single factor credit risk models: an empirical investigation

Hestia Jacomina Stoffberg and Gary van Vuuren

Applied Economics, 2016, vol. 48, issue 17, 1602-1617

Abstract: The internal ratings--based (IRB) approach (based on a single risk factor model) was designed by the Basel Committee on Banking Supervision (BCBS) to determine banks’ regulatory credit risk capital. Key inputs of the model -- asset correlations -- are prescribed by the regulator; relevant banks must use them for capital determination. To ascertain whether these correlations are too onerous or too lenient, empirical asset correlations embedded in loss data spanning different loss milieu were backed out of the regulatory model. Static and rolling correlations over a period of time were compared with the prescribed correlations for developed and developing economies and found to be significantly more conservative.

Date: 2016
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DOI: 10.1080/00036846.2015.1103040

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