Accurate Evaluation of Expected Shortfall for Linear Portfolios with Elliptically Distributed Risk FactorsReportar como inadecuado


Accurate Evaluation of Expected Shortfall for Linear Portfolios with Elliptically Distributed Risk Factors


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Academic Editors: Marc S. Paolella and Michael McAleer

Abstract We provide an accurate closed-form expression for the expected shortfall of linear portfolios with elliptically distributed risk factors. Our results aim to correct inaccuracies that originate in Kamdem 2005 and are present also in at least thirty other papers referencing it, including the recent survey by Nadarajah et al. 2014 on estimation methods for expected shortfall. In particular, we show that the correction we provide in the popular multivariate Student t setting eliminates understatement of expected shortfall by a factor varying from at least four to more than 100 across different tail quantiles and degrees of freedom. As such, the resulting economic impact in financial risk management applications could be significant. We further correct such errors encountered also in closely related results in Kamdem 2007 and 2009 for mixtures of elliptical distributions. More generally, our findings point to the extra scrutiny required when deploying new methods for expected shortfall estimation in practice. View Full-Text

Keywords: expectedshortfall; ellipticaldistributions; multivariateStudent t distribution; mixturesof elliptical distributions; accurate closed-form expression expectedshortfall; ellipticaldistributions; multivariateStudent t distribution; mixturesof elliptical distributions; accurate closed-form expression





Autor: Dobrislav Dobrev∗ * , Travis D. Nesmith * and Dong Hwan Oh *

Fuente: http://mdpi.com/



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