Detection of collective and point anomalies in the presence of trend and seasonality
存在趋势与季节性时的集体异常和点异常检测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究含趋势和季节性的时间序列分解与异常检测,因此归入时间序列,不将异常自动视为结构变化。
存在趋势与季节性时的集体异常和点异常检测AI 解读 ↓
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Detecting anomalies in time series data is a challenging task with broad relevance in many applications. Existing methods work effectively only under idealized conditions, typically focusing on point anomalies or assuming a constant baseline. Our approach overcomes these limitations by detecting both collective and point anomalies, while allowing for polynomial trends and seasonal patterns. We establish statistical theory demonstrating that our method accurately decomposes the time series into anomaly, trend, seasonality, and remainder components. We further show that the approach provides a consistent estimate of the number of anomalies and their locations. Simulation studies confirm its strong detection performance with finite samples, and an application to energy price data illustrates its practical utility.