Detecting Level Shifts in Time Series
时间序列水平突变的检测AI 解读 ↓
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AI 根据所提供的论文材料归类:研究对象明确是时间序列中的水平突变,方法围绕突变检测与异常值区分,直接对应时间序列和结构变化。
时间序列水平突变的检测AI 解读 ↓
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This article demonstrates the difficulty that traditional outlier detection methods, such as that of R. S. Tsay, have in identifying level shifts in time series. Initializing the outlier/level-shift search with an estimated autoregressive moving average model lowers the power of the level-shift detection statisti cs. Furthermore, the rule employed by these methods for distinguishing between level shifts and innovation outliers does not work well in t he presence of level shifts. A simple modification to Tsay's procedure is proposed that improves the ability to correctly identify level shift s. This modification is relatively easy to implement and appears to be quite effective in practice.
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