2003, Volume 65, Pt. 4 , 821--835

DENSITY EXPANSIONS BASED ON THE MULTIVARIATE SKEW NORMAL DISTRIBUTION

By

ARJUN K. GUPTA, Bowling Green State University, USA and T\~ONU KOLLO, University of Tartu, Estonia

SUMMARY. In this paper the multivariate skew normal distribution, introduced by Azzalini and Dalla Valle (1996), is used as a basis in density expansions.  A short summary of main properties of  the distribution is given and the first three derivatives of the multivariate skew normal density function are presented. These results are used in a general formal density expansion through the multivariate skew normal distribution. The general density expansion is   specified for some choices of parameters, the results are illustrated on an example where the density function of the largest eigenvalue of the sample dispersion matrix is approximated.

AMS (1991) subject classification. Primary 62H10; secondary 62E17.

Key words and phrases. Skew normal distribution, moment generating function, multivariate cumulants and moments, multivariate density expansion.

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