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How does the choice of Value-at-Risk estimator influence asset allocation decisions? (English) Zbl 1406.91423
Summary: Considering the growing need for managing financial risk, Value-at-Risk (VaR) prediction and portfolio optimisation with a focus on VaR have taken up an important role in banking and finance. Motivated by recent results showing that the choice of VaR estimator does not crucially influence decision-making in certain practical applications (e.g. in investment rankings), this study analyses the important question of how asset allocation decisions are affected when alternative VaR estimation methodologies are used. Focusing on the most popular, successful and conceptually different conditional VaR estimation techniques (i.e. historical simulation, peak over threshold method and quantile regression) and the flexible portfolio model of R. Campbell et al. [“Optimal portfolio selesction in a Value-at-Risk framework”, J. Banking Finance. 25, No. 9, 1789–1804 (2001; doi:10.1016/S0378-4266(00)00160-6)], we show in an empirical example and in a simulation study that these methods tend to deliver similar asset weights. In other words, optimal portfolio allocations appear to be not very sensitive to the choice of VaR estimator. This finding, which is robust in a variety of distributional environments and pre-whitening settings, supports the notion that, depending on the specific application, simple standard methods (i.e. historical simulation) used by many commercial banks do not necessarily have to be replaced by more complex approaches (based on, e.g. extreme value theory).
91G10 Portfolio theory
91G70 Statistical methods; risk measures
CAViaR; Dowd
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