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Two symmetric and computationally efficient Gini correlations

Author

Listed:
  • Vanderford Courtney

    (Department of Mathematics, University of Mississippi)

  • Sang Yongli

    (Department of Mathematics, University of Louisiana at Lafayette)

  • Dang Xin

    (Department of Mathematics, University of Mississippi)

Abstract

Standard Gini correlation plays an important role in measuring the dependence between random variables with heavy-tailed distributions. It is based on the covariance between one variable and the rank of the other. Hence for each pair of random variables, there are two Gini correlations and they are not equal in general, which brings a substantial difficulty in interpretation. Recently, Sang et al (2016) proposed a symmetric Gini correlation based on the joint spatial rank function with a computation cost of O(n2) where n is the sample size. In this paper, we study two symmetric and computationally efficient Gini correlations with the computational complexity of O(n log n). The properties of the new symmetric Gini correlations are explored. The influence function approach is utilized to study the robustness and the asymptotic behavior of these correlations. The asymptotic relative efficiencies are considered to compare several popular correlations under symmetric distributions with different tail-heaviness as well as an asymmetric log-normal distribution. Simulation and real data application are conducted to demonstrate the desirable performance of the two new symmetric Gini correlations.

Suggested Citation

  • Vanderford Courtney & Sang Yongli & Dang Xin, 2020. "Two symmetric and computationally efficient Gini correlations," Dependence Modeling, De Gruyter, vol. 8(1), pages 373-395, January.
    • Handle: RePEc:vrs:demode:v:8:y:2020:i:1:p:373-395:n:13
    DOI: 10.1515/demo-2020-0020
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    References listed on IDEAS

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