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Calibrating Initial Shocks in Bank Stress Test Scenarios: An Outlier Detection Based Approach

  • Darne, O.
  • Levy-Rueff, O.
  • Pop, A.

We propose a rigorous and flexible methodological framework to select and calibrate initial shocks to be used in bank stress test scenarios based on statistical techniques for detecting outliers in time series of risk factors. Our approach allows us to characterize not only the magnitude, but also the persistence of the initial shock. The stress testing exercises regularly conducted by supervisors distinguish between two types of shocks, transitory and permanent. One of the main advantages of our framework, particularly relevant as regards the calibration of transitory shocks, is that it allows considering various reverting patterns for the stressed variables and informs the choice of the appropriate stress horizon. We illustrate the proposed methodology by implementing outlier detection algorithms to several time series of (macro)economic and financial variables typically used in bank stress testing.

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Paper provided by Banque de France in its series Working papers with number 426.

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Length: 52 pages
Date of creation: 2013
Date of revision:
Handle: RePEc:bfr:banfra:426
Contact details of provider: Postal: Banque de France 31 Rue Croix des Petits Champs LABOLOG - 49-1404 75049 PARIS
Web page: http://www.banque-france.fr/

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  1. Thomas Breuer & Martin Jandačka & Javier Mencía & Martin Summer, 2010. "A systematic approach to multi-period stress testing of portfolio credit risk," Banco de Espa�a Working Papers 1018, Banco de Espa�a.
  2. Newey, W.K. & West, K.D., 1992. "Automatic Lag Selection in Covariance Matrix Estimation," Working papers 9220, Wisconsin Madison - Social Systems.
  3. Thomas Breuer & Martin Jandacka & Klaus Rheinberger & Martin Summer, 2009. "How to find plausible, severe, and useful stress scenarios," Working Papers 150, Oesterreichische Nationalbank (Austrian Central Bank).
  4. Martin Cihák, 2007. "Introduction to Applied Stress Testing," IMF Working Papers 07/59, International Monetary Fund.
  5. Michael Boss & Gerald Krenn & Claus Puhr & Martin Summer, 2006. "Systemic Risk Monitor: A Model for Systemic Risk Analysis and Stress Testing of Banking Systems," Financial Stability Report, Oesterreichische Nationalbank (Austrian Central Bank), issue 11, pages 83-95.
  6. Simon Dubecq & Christian Gouriéroux, 2012. "Shock on Variable or Shock on Distribution with Application to Stress-Tests," Working Papers 2012-03, Centre de Recherche en Economie et Statistique.
  7. Maria Soledad Martinez Peria & Giovanni Majnoni & Matthew T. Jones & Winfrid Blaschke, 2001. "Stress Testing of Financial Systems; An Overview of Issues, Methodologies, and FSAP Experiences," IMF Working Papers 01/88, International Monetary Fund.
  8. Martin Cihak, 2004. "Stress Testing: A Review of Key Concepts," Research and Policy Notes 2004/02, Czech National Bank, Research Department.
  9. Mathias Drehmann & Steffen Sorensen & Marco Stringa, 2008. "The integrated impact of credit and interest rate risk on banks: an economic value and capital adequacy perspective," Bank of England working papers 339, Bank of England.
  10. Varotto, Simone, 2012. "Stress testing credit risk: The Great Depression scenario," Journal of Banking & Finance, Elsevier, vol. 36(12), pages 3133-3149.
  11. Marco Sorge, 2004. "Stress-testing financial systems: an overview of current methodologies," BIS Working Papers 165, Bank for International Settlements.
  12. Claudio Borio & Claudio Mathias Drehmann, 2009. "Towards an operational framework for financial stability: "fuzzy" measurement and its consequences," BIS Working Papers 284, Bank for International Settlements.
  13. Borio, Claudio & Drehmann, Mathias & Tsatsaronis, Kostas, 2014. "Stress-testing macro stress testing: Does it live up to expectations?," Journal of Financial Stability, Elsevier, vol. 12(C), pages 3-15.
  14. Darne, Olivier & Diebolt, Claude, 2004. "Unit roots and infrequent large shocks: new international evidence on output," Journal of Monetary Economics, Elsevier, vol. 51(7), pages 1449-1465, October.
  15. De Bandt, O. & Oung, V., 2004. "Assessment of “stress tests” conducted on the French banking system," Financial Stability Review, Banque de France, issue 5, pages 55-72, November.
  16. Antonella Foglia, 2009. "Stress Testing Credit Risk: A Survey of Authorities' Aproaches," International Journal of Central Banking, International Journal of Central Banking, vol. 5(3), pages 9-45, September.
  17. Mathias Drehmann & Claudio Borio & Kostas Tsatsaronis, 2012. "Characterising the financial cycle: don't lose sight of the medium term!," BIS Working Papers 380, Bank for International Settlements.
  18. Jussi Tolvi, 2001. "Outliers in eleven Finnish macroeconomic time series," Finnish Economic Papers, Finnish Economic Association, vol. 14(1), pages 14-32, Spring.
  19. Sorge, Marco & Virolainen, Kimmo, 2006. "A comparative analysis of macro stress-testing methodologies with application to Finland," Journal of Financial Stability, Elsevier, vol. 2(2), pages 113-151, June.
  20. Mark Swinburne & Stéphanie Marie Stolz & Marina Moretti, 2008. "Stress Testing At the IMF," IMF Working Papers 08/206, International Monetary Fund.
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