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Correlation Scenarios and Correlation Stress Testing
Natalie Packham, Fabian Wöbbeking
Journal of Economic Behavior and Organization,
January
2023
Abstract
We develop a general approach for stress testing correlations of financial asset portfolios. The correlation matrix of asset returns is specified in a parametric form, where correlations are represented as a function of risk factors, such as country and industry factors. A sparse factor structure linking assets and risk factors is built using Bayesian variable selection methods. Regular calibration yields a joint distribution of economically meaningful stress scenarios of the factors. As such, the method also lends itself as a reverse stress testing framework: using the Mahalanobis distance or Highest Density Regions (HDR) on the joint risk factor distribution allows to infer worst-case correlation scenarios. We give examples of stress tests on a large portfolio of European and North American stocks.
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08.06.2021 • 14/2021
IWH Bankruptcy Update: Still No Bankruptcy Wave in Sight; Number of Impacted Jobs Reaches New Low
In May the number of corporate bankruptcies once again fell significantly. A jump in June is also unlikely, according to early indicators assessed by IWH. The number of jobs impacted by bankruptcy has fallen to the lowest level witnessed since the Corona outbreak. The IWH Bankruptcy Report, published by the Halle Institute for Economic Research (IWH), provides a monthly update on German bankruptcy statistics.
Steffen Müller
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