Abstract
Copulas provide investors with tools to model the dependence structure of financial products. The choice of copulas plays an important role in successful copula applications. This paper discusses the copula selection problem for the so-called ‘D-vine’ decomposition from a perspective of the ‘safety first’ asset allocation. The Joe-Clayton copula and the Student t copula are considered as building blocks for the D-vine structure. As an alternative to conventional approaches, the proposed pair-copula-GARCH model provides simulated asset returns for the optimal asset allocation which is implemented by using a heuristic optimisation approach. When assessing the reliability of portfolio loss prediction, it is found that the EWMA of RiskMetrics performs slightly better than the copula-GARCH models in the study of value-at-risk and expectedshortfall minimisation. However, the Joe-Clayton copula model outperforms the EWMA in the case of Omega ratio minimisation.
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