<p>Copula-based Conditional Value at Risk (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\textrm{CCVaR}\)</EquationSource> </InlineEquation>) is a real-valued tail risk measure for multivariate random vectors defined through conditioning on a copula level set. This paper considers the extension of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\textrm{CCVaR}\)</EquationSource> </InlineEquation> to dimensions <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(d\ge 2\)</EquationSource> </InlineEquation> under Archimedean dependence. While existing work has primarily treated the bivariate case, the multivariate setting involves a <i>d</i>-dimensional conditioning region and does not admit the same low-dimensional representations. For <i>d</i>-dimensional Archimedean copulas, we derive an explicit representation that reduces the defining conditional expectation to a one-dimensional form involving the multivariate Kendall distribution function and a dimension-dependent correction term, enabling tractable computation and calibration in moderate dimensions. We also examine coherence-type properties. Finally, numerical experiments using real data illustrate the behavior of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\textrm{CCVaR}\)</EquationSource> </InlineEquation> and compare it with classical <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\textrm{VaR}\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\textrm{CVaR}\)</EquationSource> </InlineEquation> under several copula families and marginal specifications.</p>

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On a Multivariate Extension for Copula-Based Conditional Value at Risk

  • Andres Mauricio Molina Barreto

摘要

Copula-based Conditional Value at Risk ( \(\textrm{CCVaR}\) ) is a real-valued tail risk measure for multivariate random vectors defined through conditioning on a copula level set. This paper considers the extension of \(\textrm{CCVaR}\) to dimensions \(d\ge 2\) under Archimedean dependence. While existing work has primarily treated the bivariate case, the multivariate setting involves a d-dimensional conditioning region and does not admit the same low-dimensional representations. For d-dimensional Archimedean copulas, we derive an explicit representation that reduces the defining conditional expectation to a one-dimensional form involving the multivariate Kendall distribution function and a dimension-dependent correction term, enabling tractable computation and calibration in moderate dimensions. We also examine coherence-type properties. Finally, numerical experiments using real data illustrate the behavior of \(\textrm{CCVaR}\) and compare it with classical \(\textrm{VaR}\) and \(\textrm{CVaR}\) under several copula families and marginal specifications.