Abstract
We introduce two local versions of Kendall’s tau conditioning on one or two random variable(s) varying less than a fixed distance. Some basic properties are proved. These local Kendall’s taus are computed for some shuffles of Min and the Farlie-Gumbel-Morgenstern copulas and shown to distinguish between complete dependence and independence copulas. A pointwise version of Kendall’s tau is also proposed and shown to distinguish between comonotonicity and countermonotonicity for complete dependence copulas.
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\(L_1 = [\max (0,\alpha +a,\alpha -1+b),\min (\alpha ,1+a,b)]\cup [\max (0,a,b),\min (\alpha ,\alpha +a,\alpha +b)]\cup [\max (0,\alpha +a,b),\min (\alpha ,1+a,b+\alpha )]\cup [\max (0,1+a,\alpha -1+b),\min (\alpha ,b+\alpha )]\cup [\max (0,\alpha +b,a),\min (\alpha ,1+a)]\cup [\max (0,\alpha +b,1+a),\alpha ]\) and \(L_2 = [\max (1-\alpha ,\alpha +a,\alpha +b),\min (1,1+a,1+b)]\cup [\max (1-\alpha ,a,1+b),\min (1,\alpha +a,\alpha +1+b)]\cup [\max (1-\alpha ,\alpha +a,1+b),\min (1,1+a,\alpha +1+b)]\cup [\max (1-\alpha ,1+a,\alpha +b),\min (1,\alpha +1+b)]\cup [\max (1-\alpha ,a,\alpha +1+b),\min (1,1+a)]\cup [\max (1-\alpha ,1+a,\alpha +1+b),1]\).
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Acknowledgments
The authors thank the anonymous referee for comments and suggestions. The last author would also like to thank the Commission on Higher Education and the Thailand Research Fund for the support through grant no. RSA5680037.
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Buthkhunthong, P., Junchuay, A., Ongeera, I., Santiwipanont, T., Sumetkijakan, S. (2015). Local Kendall’s Tau. In: Huynh, VN., Kreinovich, V., Sriboonchitta, S., Suriya, K. (eds) Econometrics of Risk. Studies in Computational Intelligence, vol 583. Springer, Cham. https://doi.org/10.1007/978-3-319-13449-9_11
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DOI: https://doi.org/10.1007/978-3-319-13449-9_11
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