| 基于小波变换多维时间序列最新变化点检测 |
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| 引用本文：陈雪文.基于小波变换多维时间序列最新变化点检测[J].计算技术与自动化,2022,(1):136-140 |
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| 中文摘要:现代数据科学中存在大量的多维时间序列数据，检测多维时间序列中的最新变化点对于短期预测很重要。一种改进的方法被提出,以检测此类多维时间序列数据中最新变化点。通过使用小波变换，将多维时间序列中的变化点检测问题转化为相对较容易的多维面板数据中的变化点检测问题。该方法旨在跨时间序列合并信息，以便优先推断多个序列中同一时间点的最新变化。通过对每个时间序列的输出进行后处理，获取最新变化点的时间集及该时间最近变化点的序列集。最后使用R软件以模拟数据和S&P500数据实验证明了该方法的有效性。 |
| 中文关键词:多维时间序列 小波变换 惩罚成本 最新变化点 |
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| Latest Change Point Detection of Multi-dimensional Time Series Based on Wavelet Transform |
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| Abstract:There are a lot of multi-dimensional time series data in modern data science, and detecting the latest change points in multi-dimensional time series is very important for short-term forecasting. An improved method is proposed to detect the latest change points in such multi-dimensional time series data. By using wavelet transform, the problem of detecting change points in the second-order structure of multi-dimensional time series is transformed into a relatively easy problem of detecting change points in multi-dimensional panel data. This method aims to merge information across time series in order to prioritize the latest changes at the same time point in multiple series. By post-processing the output of each time series, the time set of the latest change point and the sequence set of the latest change point in time are obtained. Finally, the use of R software to simulate data and S&P500 data experiments proved the effectiveness of the method. |
| keywords:multi-dimensional time series wavelet transform penalty cost latest change point |
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