Every week, we select a recently published Open Access article to feature. This week’s article comes from Statistica Neerlandica and reviews the properties of the basic distributional theory for the product of zero mean correlated normal random variables.
The article’s abstract is given below, with the full article available to read here.
(2022). The basic distributional theory for the product of zero mean correlated normal random variables. Statistica Neerlandica, 1– 21. https://doi.org/10.1111/stan.12267
The product of two zero mean correlated normal random variables, and more generally the sum of independent copies of such random variables, has received much attention in the statistics literature and appears in many application areas. However, many important distributional properties are yet to be recorded. This review paper fills this gap by providing the basic distributional theory for the sum of independent copies of the product of two zero mean correlated normal random variables. Properties covered include probability and cumulative distribution functions, generating functions, moments and cumulants, mode and median, Stein characterisations, representations in terms of other random variables, and a list of related distributions. We also review how the product of two zero mean correlated normal random variables arises naturally as a limiting distribution, with an example given for the distributional approximation of double Wiener-Itô integrals.