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The proposed method is based on thick-pen transform (TPT), in which the basic idea is to draw along the data with a pen of a given thickness. Since TPT is a multi-scale visualization technique, it provides some information on the temporal tendency of neighborhood values. We introduce a modified TPT, termed \u2018ensemble TPT (e-TPT)\u2019, to enhance the temporal resolution of zero-inflated time series data that is crucial for clustering them efficiently. Furthermore, this study defines a modified similarity measure for zero-inflated time series data considering e-TPT and proposes an efficient iterative clustering algorithm suitable for the proposed measure. Finally, the effectiveness of the proposed method is demonstrated by simulation experiments and two real datasets: step count data and newly confirmed COVID-19 case data.<\/jats:p>","DOI":"10.1007\/s00357-023-09437-z","type":"journal-article","created":{"date-parts":[[2023,6,12]],"date-time":"2023-06-12T06:02:01Z","timestamp":1686549721000},"page":"407-431","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Zero-Inflated Time Series Clustering Via Ensemble Thick-Pen Transform"],"prefix":"10.1007","volume":"40","author":[{"given":"Minji","family":"Kim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hee-Seok","family":"Oh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8698-8667","authenticated-orcid":false,"given":"Yaeji","family":"Lim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,6,12]]},"reference":[{"issue":"4","key":"9437_CR1","doi-asserted-by":"publisher","first-page":"1726","DOI":"10.1214\/15-AOAS861","volume":"9","author":"C Bouveyron","year":"2015","unstructured":"Bouveyron, C., C\u00f4me, E., & Jacques, J. 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