Detection of Change in the Spatiotemporal Mean Function
时空均值函数变化的检测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确使用函数值时间序列并检测年度均值模式变化,对应时间序列与结构变化方法。
时空均值函数变化的检测AI 解读 ↓
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Summary The paper develops inferential methodology for detecting a change in the annual pattern of an environmental variable measured at fixed locations in a spatial region. Using a framework built on functional data analysis, we model observations as a collection of function-valued time sequences available at many sites. Each sequence is modelled as an annual mean function, which may change, plus a sequence of error functions, which are spatially correlated. The tests statistics extend the cumulative sum paradigm to this more complex setting. Their asymptotic distributions are not parameter free because of the spatial dependence but can be effectively approximated by Monte Carlo simulations. The new methodology is applied to precipitation data. Its finite sample performance is assessed by a simulation study.