English, Article edition: VaR stress tests for highly non-linear portfolios John H.J. Einmahl; Walter N. Foppen; Olivier W. Laseroms; ...

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Bookmark: http://trove.nla.gov.au/version/8715
Physical Description
  • article
Language
  • English

Edition details

Title
  • VaR stress tests for highly non-linear portfolios
Author
  • John H.J. Einmahl
  • Walter N. Foppen
  • Olivier W. Laseroms
  • Casper G. de Vries
Physical Description
  • article
Notes
  • Purpose – It is the purpose of this article to improve existing methods for risk management, in particular stress testing, for derivative portfolios. The method is explained and compared with other methods, using hypothetical portfolios. Design/​methodology/​approach – Closed form option pricing formulas are used for valuation. To assess the risk, future price movements are modeled by an empirical distribution in conjunction with a semi-parametrically estimated tail. This approach captures the non-linearity of the portfolio risk and it is possible to estimate the extreme risk adequately. Findings – It is found that this method gives excellent results and that it clearly outperforms the standard approach based on a quadratic approximation and the normal distribution. Especially for very high confidence levels, the improvement is dramatic. Practical implications – In applications of this type the present method is highly preferable to the classical Delta-Gamma cum normal distribution approach. Originality/​value – This paper uses a “statistics of extremes” approach to stress testing. With this approach it is possible to estimate the far tail of a derivative portfolio adequately.
  • Portfolio investment, Return on capital employed, Statistics
  • RePEc:eme:jrfpps:v:6:y:2005:i:5:p:382-387
Language
  • English
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