Published online by Cambridge University Press: 01 July 2016
Empirical point processes of exceedances play an important role in extreme value theory, and their limiting behaviour has been extensively studied. Here, we provide explicit bounds on the accuracy of approximating an exceedance process by a compound Poisson or Poisson cluster process, in terms of a Wasserstein metric that is generally more suitable for the purpose than the total variation metric. The bounds only involve properties of the finite, empirical sequence that is under consideration, and not of any limiting process. The argument uses Bernstein blocks and Lindeberg's method of compositions.
Current address: Brunel University, Uxbridge, Middlesex UB8 3PH, UK.
Current address: Department of Mathematics and Statistics, University of Melbourne, Victoria 3010, Australia.
Supported in part by Schweizer Nationalfonds Projekt Nr. 20-50686.97.
Supported by an Australian Research Council Small Grant from the University of New South Wales.