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| Identification of Outlier Patterns in Multivariate Time Series |
| WENG XiaoQing1,2, SHEN JunYi1 |
1.Institute of Computer Software, Xi’an Jiaotong University, Xi’an 710049
2.Computer Center, Hebei University of Economics and Trade, Shijiazhuang 050061 |
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Abstract Multivariate time series (MTS) is widely available in many fields including finance, medicine, science and engineering. An approach for identifying outlier patterns in MTS is proposed. By using bottomup segmentation algorithm, MTS is divided into nonoverlapping subsequences. An extended Frobenius norm is used to compare the similarity between two MTS subsequences. Kmeans algorithm is employed to cluster MTS subsequences into some classes. According to the definitions of outlier patterns, the outlier patterns in MTS can be identified from the classes. Experiments are performed on two realworld datasets: stock market dataset and brain computer interface dataset. The experimental results show the effectiveness of the algorithm.
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Received: 09 May 2006
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2007, Vol. 20 
