The efficient computation and the sensitivity analysis of finite-time ruin probabilities and the estimation of risk-based regulatory capital

Mark S. Joshi, Dan Zhu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Solvency regulations require financial institutions to hold initial capital so that ruin is a rare event. An important practical problem is to estimate the regulatory capital so the ruin probability is at the regulatory level, typically with less than 0.1% over a finite-Time horizon. Estimating probabilities of rare events is challenging, since naive estimations via direct simulations of the surplus process is not feasible. In this paper, we present a stratified sampling algorithm for estimating finite-Time ruin probabilities. We further introduce a sequence of measure changes to remove the pathwise discontinuities of the estimator, and compute unbiased first and second-order derivative estimates of the finite-Time ruin probabilities with respect to both distributional and structural parameters. We then estimate the regulatory capital and its sensitivities. These estimates provide information to insurance companies for meeting prudential regulations as well as designing risk management strategies. Numerical examples are presented for the classical model, the Sparre Andersen model with interest and the periodic risk model with interest to demonstrate the speed and efficacy of our methodology.

Original languageEnglish
Pages (from-to)431-467
Number of pages37
JournalASTIN Bulletin
Volume46
Issue number2
DOIs
Publication statusPublished - 1 May 2016

Keywords

  • Monte Carlo
  • risk-based capital
  • ruin probabilities
  • Sensitivity analysis

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