Extremal properties of max-autoregressive moving average processes for modelling extreme river flows
用于极端河流流量建模的最大自回归移动平均过程的极值性质AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究时间序列的 Max-ARMA 模型及滞后依赖;此处按方法归类,应用对象是河流流量。
用于极端河流流量建模的最大自回归移动平均过程的极值性质AI 解读 ↓
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Max-autogressive moving average (Max-ARMA) processes are powerful tools for modelling time series data with heavy-tailed behaviour; these are a non-linear version of the popular autoregressive moving average models. River flow data typically have features of heavy tails and non-linearity, as large precipitation events cause sudden spikes in the data that then exponentially decay. Therefore, stationary Max-ARMA models are a suitable candidate for capturing the unique temporal dependence structure exhibited by river flows. This paper contributes to advancing our understanding of the extremal properties of stationary Max-ARMA processes. We detail the first approach for deriving the extremal index, the lagged asymptotic dependence coefficient, and an efficient simulation for a general Max-ARMA process. We use the extremal properties, coupled with the belief that Max-ARMA processes provide only an approximation to extreme river flow, to fit such a model which can broadly capture river flow behaviour over a high threshold. We make our inference under a reparametrisation which gives a simpler parameter space that excludes cases where any parameter is non-identifiable. We illustrate results for river flow data from the UK River Thames.