Survival Mixture Model for Credit Risk Analysis

Mo Leo S. F. and Yau Kelvin K. W.
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Mo Leo S. F.: City University of Hong Kong
Yau Kelvin K. W.: City University of Hong Kong

Asia-Pacific Journal of Risk and Insurance, 2010, vol. 4, issue 2, 20

Abstract: The survival mixture model, which is an extension of the ordinary survival model that allows the existence of a fraction of the borrowers to be risk-free, is applied to credit risk analysis. In a regression setting, the effect of borrowers' characteristics on both the risk-free probability and default risk can be assessed simultaneously. Using the C statistic as a measure of accuracy, the survival mixture model shows improved power to discriminate between 'good' and 'bad' customers, when compared with other commonly used statistical models for credit risk analysis. A simulation study is conducted to assess the performance of the proposed numerical estimation method. The survival mixture model not only concentrates on the time-to-default of the borrowers, it also predicts the probability of being risk-free. It provides additional information about the borrowers' default risk in relation to their characteristics, which assists the lending institutions to better manage credit risk.

Keywords: C statistic; risk-free borrower; survival mixture model (search for similar items in EconPapers)
Date: 2010
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DOI: 10.2202/2153-3792.1061

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