Duan, Jin-Chuan; Li, Shuping - In: The Journal of finance and data science : JFDS 7 (2021), pp. 115-125
A high-quality and granular probability of default (PD) model is on many practical dimensions far superior to any categorical credit rating system. Business adoption of a PD model, however, needs to factor in the long-established business/regulatory conventions built around letter-based credit...