2021 Consensus Patterns of a Set of Time Series via a Wavelet-Based Temporal Localization: Emphasizing the Utility over Point-Wise Averaging and Averaging under Dynamic Time Warping
Chekhaprabha Priyadarshanee Waduge, Naleen Chaminda Ganegoda, Darshana Chitraka Wickramarachchi, Ravindra Shanthakumar Lokupitiya
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J. Appl. Math. 2021: 1-19 (2021). DOI: 10.1155/2021/5535363

Abstract

Summarizing or averaging a sequential data set (i.e., a set of time series) can be comprehensively approached as a result of sophisticated computational tools. Averaging under Dynamic Time Warping (DTW) is one such tool that captures consensus patterns. DTW acts as a similarity measure between time series, and subsequently, an averaging method must be executed upon the behaviour of DTW. However, averaging under DTW somewhat neglects temporal aspect since it is on the search of similar appearances rather than stagnating on corresponding time-points. On the contrary, the mean series carrying point-wise averages provides only a weak consensus pattern as it may over-smooth important temporal variations. As a compromise, a pool of consensus series termed Ultimate Tamed Series (UTS) is studied here that adheres to temporal decomposition supported by the discrete Haar wavelet. We claim that UTS summarizes localized patterns, which would not be reachable via the series under DTW or the mean series. Neighbourhood of localization can be altered as a user can customize different levels of decomposition. In validation, comparisons are carried out with the series under DTW and the mean series via Euclidean distance and the distance resulted by DTW itself. Two sequential data sets are selected for this purpose from a standard repository.

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Chekhaprabha Priyadarshanee Waduge. Naleen Chaminda Ganegoda. Darshana Chitraka Wickramarachchi. Ravindra Shanthakumar Lokupitiya. "Consensus Patterns of a Set of Time Series via a Wavelet-Based Temporal Localization: Emphasizing the Utility over Point-Wise Averaging and Averaging under Dynamic Time Warping." J. Appl. Math. 2021 1 - 19, 2021. https://doi.org/10.1155/2021/5535363

Information

Received: 30 January 2021; Accepted: 23 June 2021; Published: 2021
First available in Project Euclid: 28 July 2021

Digital Object Identifier: 10.1155/2021/5535363

Rights: Copyright © 2021 Hindawi

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