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Asymptotic behavior of an intrinsic rank-based estimator of the Pickands dependence function constructed from
Axel Bücher1, Christian Genest2, Richard A Lockhart3
1Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany.
Abstract:
A bivariate extreme-value copula is characterized by its Pickands dependence function, i.e., a convex function defined on the unit interval satisfying boundary conditions. This paper investigates the large-sample behavior of a nonparametric estimator of this function due to Cormier et al. (Extremes 17:633-659, 2014). These authors showed how to construct this estimator through constrained quadratic median B-spline smoothing of pairs of pseudo-observations derived from a random sample. Their estimator is shown here to exist whatever the order of the B-spline basis, and its consistency is established under minimal conditions. The large-sample distribution of this estimator is also determined under the additional assumption that the underlying Pickands dependence function is a B-spline of given order with a known set of knots.
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