Using a Bootstrap Approach to Rate the Raters

André Güttler ()

Financial Markets and Portfolio Management, 2005, vol. 19, issue 3, 277-295

Abstract: This paper compares the accuracy of credit ratings of Moody's and Standard and Poor's. Based on 11,428 issuer ratings and 350 defaults in several datasets from 1999 to 2003 a slight advantage for the rating system of Moody's is detected. Compared to former research, the robustness of the results is increased by using nonparametric bootstrap approaches. Furthermore, robustness checks are made to control for the impact of watchlist entries, staleness of ratings, and the effect of unsolicited ratings on the results. Copyright Swiss Society for Financial Market Research 2005

Date: 2005
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DOI: 10.1007/s11408-005-4693-1

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