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Author: Alexandra Badea

  • MATHEMATICAL MODELLING OF SOCIO-ECONOMIC PROCESSES AND SYSTEMS

    Bivariate Composite distributions with Pareto tail for modeling bivariate data

    • Alexandra Badea
    • Catalina Bolance
    • Raluca Vernic
    Mathematical Modeling, Vol. 7 (2023), Issue 3, pg(s) 87-89
    • Abstract
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    •  Article PDF

    Financial data or insurance claim data often exhibit skewness to the right and extreme values, so that classical right skewed distributions like Exponential, Gamma, Weibull or Lognormal fail to capture their behavior. However, built from different distributions on distinct contiguous intervals, two-component spliced (or composite) models often provide a better fit on the right tail, especially since the right tail distribution is considered to be of heavy-tailed type (usually Pareto). In this work, we introduce two bivariate composite distributions defined from a bivariate type I Pareto distribution for values larger than some thresholds, and a bivariate distribution less heavy-tailed on the complementary domain. We present some properties of the new distributions and discuss an estimation method, illustrated on a real data set from insurance.

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