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Specification and Informational Issues in Credit Scoring
by Nicholas M. Kiefer and C. Erik Larson
Lenders use rating and scoring models to rank credit applicants on their expected performance. The models and approaches are numerous. We explore the possibility that estimates generated by models developed with data drawn solely from extended loans are less valuable than they should be because of selectivity bias. We investigate the value of "reject inference" - methods that use a rejected applicant's characteristics, rather than loan performance data, in scoring model development. In the course of making this investigation, we also discuss the advantages of using parametric as well as nonparametric modeling. These issues are discussed and illustrated in the context of a simple stylized model.
Any whole or partial reproduction of material in this paper should include the following citation: Nicholas M. Kiefer and C. Erik Larson, "Specification and Informational Issues in Credit Scoring," Office Comptroller of the Currency, E&PA Working Paper 2004-5, December 2004.