Quasi-Exponentiated Normal Distributions: Mixture Representations and Asymmetrization

Abstract

In the paper, quasi-exponentiated normal distributions are introduced for any real power (exponent) no less than two. With natural exponents, the quasi-exponentiated normal distributions coincide with the distributions of the corresponding powers of normal random variables with zero mean. Their representability as scale mixtures of normal and exponential distributions is proved. The mixing distributions are written out in the closed form. Two approaches to the construction of asymmetric quasi-exponentiated normal distributions are described. A limit theorem is proved for sums of a random number of independent random variables in which the asymmetric quasi-exponentiated normal distribution is the limit law.

Keywords

• quasi-exponentiated normal distribution
• exponential power distribution
• generalized gamma distribution
• scale mixture
• limit theorem
• random sum