Kernel Density Estimation for Heavy-Tailed Distributions Using the Champernowne Transformation
32 Pages Posted: 22 Apr 2005
Date Written: January 2005
Abstract
When estimating loss distributions in insurance, large and small losses are usually split because it is difficult to find a simple parametric model that fits all claim sizes. This approach involves determining the threshold level between large and small losses. In this article a unified approach to the estimation of loss distributions is presented. We propose an estimator obtained by transforming the data set with a modification of the Champernowne cdf and then estimating the density of the transformed data by use of the classical kernel density estimator. We investigate the asymptotic bias and variance of the proposed estimator. In a simulation study, the proposed method shows a good. performance. We also present two applications dealing with claims costs in insurance.
Keywords: Actuarial loss models, Transformation, Skewness, Champernowne distribution, Extreme Value Theory
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