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• W3013071837 abstract "Errors are prevalent in time series data, such as GPS trajectories or sensor readings. Existing methods focus more on anomaly detection but not on repairing the detected anomalies. By simply filtering out the dirty data via anomaly detection, applications could still be unreliable over the incomplete time series. Instead of simply discarding anomalies, we propose to (iteratively) repair them in time series data, by creatively bonding the beauty of temporal nature in anomaly detection with the widely considered minimum change principle in data repairing. Our major contributions include: (1) a novel framework of iterative minimum repairing (IMR) over time series data, (2) explicit analysis on convergence of the proposed iterative minimum repairing, and (3) efficient estimation of parameters in each iteration. Remarkably, with incremental computation, we reduce the complexity of parameter estimation from O(n) to O(1). Experiments on real datasets demonstrate the superiority of our proposal compared to the state-of-the-art approaches. In particular, we show that (the proposed) repairing indeed improves the time series classification application." @default.
• W3013071837 created "2020-04-03" @default.
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• W3013071837 date "2020-03-27" @default.
• W3013071837 modified "2023-09-25" @default.
• W3013071837 title "Time Series Data Cleaning: From Anomaly Detection to Anomaly Repairing (Technical Report)." @default.
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• W3013071837 hasPublicationYear "2020" @default.
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