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The performance of credit rating systems in the assessment of collateral used in Eurosystem monetary policy operations

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  • François Coppens
  • Fernando González
  • Gerhard Winkler

Abstract

The aims of this paper are twofold: first, we attempt to express the threshold of a single “A” rating as issued by major international rating agencies in terms of annualised probabilities of default. We use data from Standard & Poor’s and Moody’s publicly available rating histories to construct confidence intervals for the level of probability of default to be associated with the single “A” rating. The focus on the single “A” rating level is not accidental, as this is the credit quality level at which the Eurosystem considers financial assets to be eligible collateral for its monetary policy operations. The second aim is to review various existing validation models for the probability of default which enable the analyst to check the ability of credit assessment systems to forecast future default events. Within this context the paper proposes a simple mechanism for the comparison of the performance of major rating agencies and that of other credit assessment systems, such as the internal ratings-based systems of commercial banks under the Basel II regime. This is done to provide a simple validation yardstick to help in the monitoring of the performance of the different credit assessment systems participating in the assessment of eligible collateral underlying Eurosystem monetary policy operations. Contrary to the widely used confidence interval approach, our proposal, based on an interpretation of p-values as frequencies, guarantees a convergence to an ex ante fixed probability of default (PD) value. Given the general characteristics of the problem considered, we consider this simple mechanism to also be applicable in other contexts.

Suggested Citation

  • François Coppens & Fernando González & Gerhard Winkler, 2007. "The performance of credit rating systems in the assessment of collateral used in Eurosystem monetary policy operations," Occasional Paper Series 65, European Central Bank.
  • Handle: RePEc:ecb:ecbops:20070065
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    References listed on IDEAS

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    1. Crouhy, Michel & Galai, Dan & Mark, Robert, 2001. "Prototype risk rating system," Journal of Banking & Finance, Elsevier, vol. 25(1), pages 47-95, January.
    2. Robert Rauhmeier & Harald Scheule, 2005. "Rating Properties and their Implication on Basel II-Capital," Published Paper Series 2005-2, Finance Discipline Group, UTS Business School, University of Technology, Sydney.
    3. Cantor, Richard, 2001. "Moody's investors service response to the consultative paper issued by the Basel Committee on Bank Supervision "A new capital adequacy framework"," Journal of Banking & Finance, Elsevier, vol. 25(1), pages 171-185, January.
    4. Dirk Tasche, 2006. "Validation of internal rating systems and PD estimates," Papers physics/0606071, arXiv.org.
    5. Krahnen, Jan Pieter & Weber, Martin, 2001. "Generally accepted rating principles: A primer," Journal of Banking & Finance, Elsevier, vol. 25(1), pages 3-23, January.
    6. Richard Cantor & Frank Packer & Kevin Cole, 1997. "Split ratings and the pricing of credit risk," Research Paper 9711, Federal Reserve Bank of New York.
    7. Dirk Tasche, 2003. "A traffic lights approach to PD validation," Papers cond-mat/0305038, arXiv.org.
    8. Lando, David & Skodeberg, Torben M., 2002. "Analyzing rating transitions and rating drift with continuous observations," Journal of Banking & Finance, Elsevier, vol. 26(2-3), pages 423-444, March.
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    1. di Mauro, Filippo & Kaufmann, Robert K. & Karadeloglou, Pavlos, 2008. "Will oil prices decline over the long run?," Occasional Paper Series 98, European Central Bank.
    2. Strauch, Rolf & Gómez-Salvador, Ramón & Ward-Warmedinger, Melanie & Turunen, Jarkko & Leiner-Killinger, Nadine & Masuch, Klaus, 2008. "Labour supply and employment in the euro area countries: developments and challenges," Occasional Paper Series 87, European Central Bank.
    3. Filippo Di Mauro & Katrin Forster, "undated". "Globalisation and the competitiveness of the Euro area," Working Papers 5, Department of the Treasury, Ministry of the Economy and of Finance.
    4. Irina Bunda, 2007. "The Changing Role of the Exchange Rate in a Globalised Economy," Post-Print halshs-00372820, HAL.
    5. Mehl, Arnaud & Bussière, Matthieu, 2008. "China's and India's roles in global trade and finance: twin titans for the new millennium?," Occasional Paper Series 80, European Central Bank.
    6. K. Barhoumi & S. Benk & R. Cristadoro & A. Den Reijer & A. Jakaitiene & P. Jelonek & A. Rua & K. Ruth & C. Van Nieuwenhuyze & G. Rünstler, 2008. "Short-term forecasting of GDP using large monthly datasets – A pseudo real-time forecast evaluation exercise," Working Paper Research 133, National Bank of Belgium.
    7. Gómez-Salvador, Ramón & Leiner-Killinger, Nadine, 2008. "An analysis of youth unemployment in the euro area," Occasional Paper Series 89, European Central Bank.
    8. Sturm, Michael & Adolf, Petra & Peschel, Dominik & Stráský, Jan, 2008. "The Gulf Cooperation Council countries: economic structures, recent developments and role in the global economy," Occasional Paper Series 92, European Central Bank.
    9. Cappiello, Lorenzo & Ferrucci, Gianluigi, 2008. "The sustainability of China's exchange rate policy and capital account liberalisation," Occasional Paper Series 82, European Central Bank.
    10. Mayerlen, Frank & Sola, Pierre & Be Duc, Louis, 2008. "The monetary presentation of the euro area balance of payments," Occasional Paper Series 96, European Central Bank.
    11. Bracke, Thierry & Bussière, Matthieu & Fidora, Michael & Straub, Roland, 2008. "A framework for assessing global imbalances," Occasional Paper Series 78, European Central Bank.
    12. Winkler, Adalbert & Polański, Zbigniew, 2008. "Russia, EU enlargement and the euro," Occasional Paper Series 93, European Central Bank.
    13. Poloni, Paolo & Agresti, Anna Maria & Baudino, Patrizia, 2008. "The ECB and IMF indicators for the macro-prudential analysis of the banking sector: a comparison of the two approaches," Occasional Paper Series 99, European Central Bank.
    14. Blattner, Tobias Sebastian & Catenaro, Marco & Ehrmann, Michael & Strauch, Rolf & Turunen, Jarkko, 2008. "The predictability of monetary policy," Occasional Paper Series 83, European Central Bank.
    15. Moutot, Philippe & Jung, Alexander & Mongelli, Francesco Paolo, 2008. "The working of the eurosystem: monetary policy preparations and decision-making - selected issues," Occasional Paper Series 79, European Central Bank.
    16. Fidora, Michael & Beck, Roland, 2008. "The impact of sovereign wealth funds on global financial markets," Occasional Paper Series 91, European Central Bank.
    17. Sauer, Stephan & Coppens, François & Mayer, Manuel & Millischer, Laurent & Resch, Florian & Schulze, Klaas, 2016. "Advances in multivariate back-testing for credit risk underestimation," Working Paper Series 1885, European Central Bank.
    18. De Santis, Roberto A. & Cappiello, Lorenzo & Baltzer, Markus & Manganelli, Simone, 2008. "Measuring financial integration in new EU Member States," Occasional Paper Series 81, European Central Bank.
    19. Morgese Borys, Magdalena & Polgár, Éva Katalin & Zlate, Andrei, 2008. "Real convergence and the determinants of growth in EU candidate and potential candidate countries: a panel data approach," Occasional Paper Series 86, European Central Bank.
    20. Winkler, Adalbert & Schokker, Hubert & Cocozza, Emidio & Herzberg, Valerie & Móré, Csaba & de Lannoy, Anthony & Gardó, Sándor & Chmielewski, Tomasz & Polgár, Éva Katalin & Habib, Maurizio Michael & Br, 2008. "Financial stability challenges in candidate countries managing the transition to deeper and more market-oriented financial systems," Occasional Paper Series 95, European Central Bank.

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    JEL classification:

    • G20 - Financial Economics - - Financial Institutions and Services - - - General
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation
    • C49 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Other

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