Bayesian vine copulas for modelling dependence in data breach losses

Jia Liu, Jackie Li, Kevin Daly

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Potentialdata breach losses represent a significant part of operational risk and can be a serious concern for risk managers and insurers. In this paper, we employ the vine copulas under a Bayesian framework to co-model incidences from different data breach types. A full Bayesian approach can allow one to select both the copulas and margins and estimate their parameters in a coherent fashion. In particular, it can incorporate process, parameter, and model uncertainties, and this is very important for applications in risk management under current regulations. We also conduct a series of sensitivity tests on the Bayesian modelling results. Using two public data sets of data breach losses, we find that the overall dependency structure and tail dependence vary significantly between different types of data breaches. The optimally selected vine structure and pairwise copulas suggest more conservative value-at-risk estimates when compared to the other suboptimal copula models.

Original languageEnglish
Pages (from-to)401-424
Number of pages24
JournalAnnals of Actuarial Science
Volume16
Issue number2
DOIs
Publication statusPublished - Jul 2022

Keywords

  • Bayesian vine copula
  • Tail dependence
  • Data breach losses

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