Title: An EM algorithm for fitting a new class of mixed exponential regression models with varying dispersion / George Tzougas, Dimitris Karlis
Author: Tzougas, George
Notes: Sumario: Regression modelling involving heavy-tailed response distributions, which have heavier tails than the exponential distribution, has become increasingly popular in many insurance settings including non-life insurance. Mixed Exponential models can be considered as a natural choice for the distribution of heavy-tailed claim sizes since their tails are not exponentially bounded. This paper is concerned with introducing a general family of mixed Exponential regression models with varying dispersion which can efficiently capture the tail behaviour of losses. Our main achievement is that we present an Expectation- Maximization (EM)-type algorithm which can facilitate maximum likelihood (ML) estimation for our class of mixed Exponential models which allows for regression specifications for both the mean and dispersion parameters. Finally, a real data application based on motor insurance data is given to illustrate the versatility of the proposed EM-type algorithm.
Other authors: Karlis, Dimitris
Other categories: 6
Derechos: In Copyright (InC): http://rightsstatements.org/vocab/InC/1.0/