Choosing the Right Norm for Change Point Detection in Functional Data
函数型数据变点检测中的范数选择AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究函数型时间序列均值的变点检验与范数选择,属于时间序列和结构变化。
函数型数据变点检测中的范数选择AI 解读 ↓
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We consider the problem of detecting a change point in a sequence of mean functions from a functional time series. We propose an $L^1$ norm based methodology and establish its theoretical validity both for classical and for relevant hypotheses. We compare the proposed method with currently available methodology that is based on the $L^2$ and supremum norms. Additionally we investigate the asymptotic behaviour under the alternative for all three methods and showcase both theoretically and empirically that the $L^1$ norm achieves the best performance in a broad range of scenarios. We also propose a power enhancement component that improves the performance of the $L^1$ test against sparse alternatives. Finally we apply the proposed methodology to both synthetic and real data.
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