Hamerle, Alfred; Liebig, Thilo; Scheule, Harald - Deutsche Bundesbank - 2004
The main challenge of forecasting credit default risk in loan portfolios is forecasting the default probabilities and … the default correlations. We derive a Merton-style threshold-value model for the default probability which treats the … asset value of a firm as unknown and uses a factor model instead. In addition, we demonstrate how default correlations can …