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Lookup NU author(s): Dr Lee Fawcett,
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
A key aim of most extreme value analyses is the estimation of the r-year return level; the wind speed, or sea-surge, or rainfall level (for example), we might expect to see once (on average) every r years. There are compelling arguments for working within the Bayesian setting here, not least the natural extension to prediction via the posterior predictive distribution. Indeed, for practitioners the posterior predictive return level has been cited as perhaps the most useful point summary from a Bayesian analysis of extremes, and yet little is known of the properties of this statistic. Inthis paper, we attempt to assess the performance of predictive return levels relative to their estimative counterparts obtained directly from the return level posterior distribution; in particular, we make comparisons with the return level posterior mean, mode and 95% credible upper bound. Differences between the predictive return level and standard summaries from the return level posterior distribution, for wind speed extremes observed in the UK, motivates this work. A large scale simulation study then reveals the superiority of the predictive return level over the other posterior summaries in many cases of practical interest.
Author(s): Fawcett L, Green AC
Publication type: Article
Publication status: Published
Journal: Stochastic Environmental Research and Risk Assessment
Print publication date: 01/08/2018
Online publication date: 31/05/2018
Acceptance date: 11/05/2018
Date deposited: 04/06/2018
ISSN (print): 1436-3240
ISSN (electronic): 1436-3259
Data Source Location: http://dx.doi.org/10.17634/154300-87
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