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Combinatorial Methods for Constructing Credit Risk Ratings

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Handbook of Financial Econometrics and Statistics

Abstract

This study uses a novel method, the Logical Analysis of Data (LAD), to reverse engineer and construct credit risk ratings which represent the creditworthiness of financial institutions and countries. LAD is a data mining method based on combinatorics, optimization, and Boolean logic that utilizes combinatorial search techniques to discover various combinations of attribute values that are characteristic of the positive or negative character of observations. The proposed methodology is applicable in the general case of inferring an objective rating system from archival data, given that the rated objects are characterized by vectors of attributes taking numerical or ordinal values. The proposed approaches are shown to generate transparent, consistent, self-contained, and predictive credit risk rating models, closely approximating the risk ratings provided by some of the major rating agencies. The scope of applicability of the proposed method extends beyond the rating problems discussed in this study and can be used in many other contexts where ratings are relevant.

We use multiple linear regression to derive the logical rating scores.

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Notes

  1. 1.

    Wall Street Letter. 2006. CFA To Senate: Follow Our Lead On Credit Rating.

  2. 2.

    The Economist, July 15, 1995, 62.

  3. 3.

    The presentation in this section is partially based on Hammer et al. (2006).

  4. 4.

    The presentation in this section is based on Hammer et al. (2012).

  5. 5.

    The presentation in this section is based on Hammer et al. (2006, 2012).

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Correspondence to Alexander Kogan .

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Appendix

Appendix

See Tables 16.15 and 16.16.

Table 16.15 Standard & Poor’s country rating system
Table 16.16 1998 Ratings

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Kogan, A., Lejeune, M.A. (2015). Combinatorial Methods for Constructing Credit Risk Ratings. In: Lee, CF., Lee, J. (eds) Handbook of Financial Econometrics and Statistics. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-7750-1_16

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  • DOI: https://doi.org/10.1007/978-1-4614-7750-1_16

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