<p>The statistical analysis of a sample estimator for the Sharpe ratio of the minimum Value-at-Risk (<i>VaR</i>) portfolio is provided. The asymptotic distribution of this estimator is found under two assumptions regarding the behavior of the vector of portfolio asset returns: it either follows a multivariate elliptic distribution with nonautocorrelated realizations or behaves as a weakly stationary Gaussian process. A simulation study shows that the standard sample estimator exhibits a significant bias. To address this, an adjusted estimator is developed that mitigates the bias. In addition, it is shown that a historical sample size of 1000 observations provides a good approximation for variances. These findings are used to examine the significance of the difference between the Sharpe ratio for the minimum <i>VaR</i> portfolio and zero with a confidence level of 0.95. Throughout the observation period, the Sharpe ratio remains equivalent to zero. The maximum confidence level for <i>VaR</i> such that the Sharpe ratio for the minimum <i>VaR</i> portfolio is definitely different from zero is determined.</p>

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Statistical Analysis of the Sharpe Ratio for the Minimum Value-at-Risk Portfolio

  • M. V. Zabolotskyy,
  • T. M. Zabolotskyy,
  • O. V. Tsiapa

摘要

The statistical analysis of a sample estimator for the Sharpe ratio of the minimum Value-at-Risk (VaR) portfolio is provided. The asymptotic distribution of this estimator is found under two assumptions regarding the behavior of the vector of portfolio asset returns: it either follows a multivariate elliptic distribution with nonautocorrelated realizations or behaves as a weakly stationary Gaussian process. A simulation study shows that the standard sample estimator exhibits a significant bias. To address this, an adjusted estimator is developed that mitigates the bias. In addition, it is shown that a historical sample size of 1000 observations provides a good approximation for variances. These findings are used to examine the significance of the difference between the Sharpe ratio for the minimum VaR portfolio and zero with a confidence level of 0.95. Throughout the observation period, the Sharpe ratio remains equivalent to zero. The maximum confidence level for VaR such that the Sharpe ratio for the minimum VaR portfolio is definitely different from zero is determined.