Multi-feature clustering of step data using multivariate functional principal component analysis
- Authors
- Song, Wookyeong; Oh, Hee-Seok; Cheung, Ying Kuen; Lim, Yaeji
- Issue Date
- Sep-2023
- Publisher
- Springer Science and Business Media Deutschland GmbH
- Keywords
- Functional data; K-means; Multivariate functional principal component analysis; PAM; Step data
- Citation
- Statistical Papers, v.65, no.4, pp 2109 - 2134
- Pages
- 26
- Journal Title
- Statistical Papers
- Volume
- 65
- Number
- 4
- Start Page
- 2109
- End Page
- 2134
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/68358
- DOI
- 10.1007/s00362-023-01467-4
- ISSN
- 0932-5026
1613-9798
- Abstract
- This study presents a new statistical method for clustering step data, a popular form of health recording data easily obtained from wearable devices. As step data are high-dimensional and zero-inflated, classical methods such as K-means and partitioning around medoid (PAM) cannot be applied directly. The proposed method is a novel combination of newly constructed variables that reflect the inherent features of step data, such as quantity, strength, and pattern, and a multivariate functional principal component analysis that can integrate all the features of the step data for clustering. The proposed method is implemented by applying a conventional clustering method, such as K-means and PAM, to the multivariate functional principal component scores obtained from these variables. Simulation studies and real data analysis demonstrate significant improvement in clustering quality. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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