Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Bayesian inference for nonstationary marginal extremes
AU - Randell, D.
AU - Turnbull, K.
AU - Ewans, K.
AU - Jonathan, P.
N1 - env.2403
PY - 2016/11
Y1 - 2016/11
N2 - We propose a simple piecewise model for a sample of peaks-over-threshold, nonstationary with respect to multidimensional covariates, and estimate it using a carefully designed and computationally efficient Bayesian inference. Model parameters are themselves parameterized as functions of covariates using penalized B-spline representations. This allows detailed characterization of non-stationarity extreme environments. The approach gives similar inferences to a comparable frequentist penalized maximum likelihood method, but is computationally considerably more efficient and allows a more complete characterization of uncertainty in a single modelling step. We use the model to quantify the joint directional and seasonal variation of storm peak significant wave height at a northern North Sea location and estimate predictive directional–seasonal return value distributions necessary for the design and reliability assessment of marine and coastal structures.
AB - We propose a simple piecewise model for a sample of peaks-over-threshold, nonstationary with respect to multidimensional covariates, and estimate it using a carefully designed and computationally efficient Bayesian inference. Model parameters are themselves parameterized as functions of covariates using penalized B-spline representations. This allows detailed characterization of non-stationarity extreme environments. The approach gives similar inferences to a comparable frequentist penalized maximum likelihood method, but is computationally considerably more efficient and allows a more complete characterization of uncertainty in a single modelling step. We use the model to quantify the joint directional and seasonal variation of storm peak significant wave height at a northern North Sea location and estimate predictive directional–seasonal return value distributions necessary for the design and reliability assessment of marine and coastal structures.
KW - Bayesian
KW - covariate
KW - extreme
KW - generalized Pareto
KW - non-stationarity
KW - ocean wave
KW - Poisson process
KW - return value
KW - spline
KW - storm severity
KW - Weibull
U2 - 10.1002/env.2403
DO - 10.1002/env.2403
M3 - Journal article
VL - 27
SP - 439
EP - 450
JO - Environmetrics
JF - Environmetrics
SN - 1099-095X
IS - 7
ER -