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Test-retest reliability measures for curve data: an overview with recommendations and supplementary code.
Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.ORCID iD: 0000-0001-9235-3062
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation.ORCID iD: 0000-0002-6339-9544
Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.ORCID iD: 0000-0001-7917-5687
2019 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116, p. 1-22Article in journal (Refereed) Epub ahead of print
Abstract [en]

The purpose of this paper is to provide an overview of available methods for reliability investigations when the outcome of interest is a curve. Curve data, or functional data, is commonly collected in biomechanical research in order to better understand different aspects of human movement. Using recent statistical developments, curve data can be analysed in its most detailed form, as functions. However, an overview of appropriate statistical methods for assessing reliability of curve data is lacking. A review of contemporary literature of reliability measures for curve data within the fields of biomechanics and statistics identified the following methods: coefficient of multiple correlation, functional limits of agreement, measures of distance and similarity, and integrated pointwise indices (an extension of univariate reliability measures to curve data, inclusive of Pearson correlation, intraclass correlation, and standard error of measurement). These methods are briefly presented, implemented (R-code available as supplementary material) and evaluated on simulated data to highlight advantages and disadvantages of the methods. Among the identified methods, the integrated intraclass correlation and standard error of measurement are recommended. These methods are straightforward to implement, enable results over the domain, and consider variation between individuals, which the other methods partly neglect.

Place, publisher, year, edition, pages
2019. p. 1-22
Keywords [en]
Agreement, functional data, kinematics, similarity
National Category
Probability Theory and Statistics Physiotherapy
Identifiers
URN: urn:nbn:se:umu:diva-163944DOI: 10.1080/14763141.2019.1655089ISI: 000488683100001PubMedID: 31578129OAI: oai:DiVA.org:umu-163944DiVA, id: diva2:1359333
Funder
Swedish Research Council, 2016-02763Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-24

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Pini, AlessiaMarkström, JonasSchelin, Lina
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