Leptokurtic moment-parameterized elliptically contoured distributions with application to financial stock returns

This article shows how multivariate elliptically contoured (EC) distributions, parameterized according to the mean vector and covariance matrix, can be built from univariate standard symmetric distributions. The obtained distributions are referred to as moment-parameterized EC (MEC) herein. As a further novelty, the article shows how to polynomially reshape MEC distributions and obtain distributions, called leptokurtic MEC (LMEC), having probability density functions characterized by a further parameter expressing their excess kurtosis with respect to the parent MEC distributions. Two estimation methods are discussed: the method of moments and the maximum likelihood. For illustrative purposes, normal, Laplace, and logistic univariate densities are considered to build MEC and LMEC models. An application to financial returns of a set of European stock indexes is finally presented.

Automated summary

This article demonstrates the construction of multivariate elliptically contoured distributions from univariate standard symmetric distributions. The concepts of moment-parameterized and leptokurtic MEC distributions are introduced, with the latter characterized by an excess kurtosis parameter. Estimation methods including the method of moments and maximum likelihood are discussed, and the application to financial returns of European stock indexes is presented.