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Appraising Credit Ratings

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  • International Monetary Fund
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    Abstract

    ROC and CAP analysis are alternative methods for evaluating a wide range of diagnostic systems, including assessments of credit risk. ROC analysis is widely used in many fields, but in finance CAP analysis is more common. We compare the two methods, using as an illustration the ability of the OECD’s country risk ratings to predict whether a country will have a program with the IMF (an indicator of financial distress). ROC and CAP analyses both have the advantage of generating measures of accuracy that are independent of the choice of diagnostic threshold, such as risk rating. ROC analysis has other beneficial features, including theories for fitting models to data and for setting the optimal threshold, that we show could also be incorporated into CAP analysis. But the natural interpretation of the ROC measure of accuracy and the independence of ROC curves from the probability of default are advantages unavailable to CAP analysis.

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    Bibliographic Info

    Paper provided by International Monetary Fund in its series IMF Working Papers with number 12/122.

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    Length: 24
    Date of creation: 01 May 2012
    Date of revision:
    Handle: RePEc:imf:imfwpa:12/122

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    Related research

    Keywords: Credit risk; Economic models; OECD; probability; equation; credit ratings; probabilities; statistics; equations; prediction; predictions; fitted model; cumulative distribution function; applications; probability distributions; standard deviation; computation; capital requirements; dummy variable; pension funds; probability density; normal distribution;

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    1. Gabriela Dobrescu & Iva Petrova & Nazim Belhocine & Emanuele Baldacci, 2011. "Assessing Fiscal Stress," IMF Working Papers 11/100, International Monetary Fund.
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