英文摘要
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A new method for predicting the probability of default (PD) is suggested in this paper. This method, which is named "Robust Logistic Regression" in this paper, is based on Logit Regression but takes outlier into consideration. Firstly, comparing the explainatory power of Robust Logistic Model and Logit Model, the Pseudo-R-square of the former is outstandingly higher than the latter. Secondly, as the empirical study for the insample data shows, CAP, ROC, KS test, Brier Score and classification table all indicate that Robust Logistic Regression can strikingly increase the model's predictive power. It means the existences of the outlier indeedly weaken model's prediction power and the method suggested in this paper can eliminate the negative influences caused by the outlier. Thirdly, as the empirical study for the outsample data shows, Robust Logit Model is better than Logit Model in CAP and KS test but in ROC and Brier Score is not. For the classification table, Robust Logit Model performs better in Type one error but worse in Type two error. It shows Robust Logistic Regression may get higer percentage of TP but lower percentage of TN and means that Robust Logistic Regression can decrease Type one error but increase Type two error.
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