Expected Shortfall: a natural coherent alternative to Value at Risk
arXiv:cond-mat/0105191
Abstract
We discuss the coherence properties of Expected Shortfall (ES) as a financial risk measure. This statistic arises in a natural way from the estimation of the "average of the 100p % worst losses" in a sample of returns to a portfolio. Here p is some fixed confidence level. We also compare several alternative representations of ES which turn out to be more appropriate for certain purposes.
to be published on "Wilmott Magazine" (http://www.wilmott.com)