The class of log-elliptical distributions is well used and studied in risk measurement and actuarial science. The reason is that risks are often skewed and positive when they describe pure risks, i.e., risks in which there is no possibility of profit. In practice, risk managers confront a system of mutually dependent risks, not only one risk. Thus, it is important to measure risks while capturing their dependence structure. In this short paper, we compute the multivariate risk measures, multivariate tail conditional expectation, and multivariate tail covariance measure for the family of log-elliptical distributions, which captures the dependence structure of the risks while focusing on the tail of their distributions, i.e., on extreme loss events. We then study our result and examine special cases, as well as the optimal portfolio selection using such measures. Finally, we show how the given multivariate tail moments can also be computed for log-skew elliptical models based on similar approaches given for the log-elliptical case.
Bibliographical noteFunding Information:
Funding: This research was supported by the Israel Science Foundation (Grant No. 1686/17).
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
- Log-elliptical distributions
- Log-skew-elliptical distributions
- Multivariate tail conditional expectation
- Multivariate tail covariance
- Tail conditional expectation
ASJC Scopus subject areas
- Computer Science (miscellaneous)
- Chemistry (miscellaneous)
- Mathematics (all)
- Physics and Astronomy (miscellaneous)