Stress testing of real credit portfolios

Ferdinand Mager and Christian Schmieder ()

No 2008,17, Discussion Paper Series 2: Banking and Financial Studies from Deutsche Bundesbank, Research Centre

Abstract: Stress testing has become a crucial point on the Basel II agenda, mainly as Pillar I estimates do not explicitly take portfolio concentration into account. We start from the credit portfolio of the German pension insurer being a cross-sectional representation of the German economy and subsequently compose three bank portfolios corresponding to a small, medium and large bank. We apply univariate and multivariate stress tests both by using the Internal Rating based (IRB) model and by a model that additionally allows for variation of correlation. In a severe multivariate stress scenario based on historical data for Germany IRB capital requirements increase by more than 80% with little differences between the credit portfolios. If stress testing is additionally applied to correlation, the Value-at-Risk increases by up to 300% and portfolio differences materialize. --

Keywords: Credit Portfolio; Exposure concentration; Stress Testing; Basel II; Economic Capital (search for similar items in EconPapers)
JEL-codes: G21 G28 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ban and nep-rmg
Date: 2008
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Persistent link: http://EconPapers.repec.org/RePEc:zbw:bubdp2:7448

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