Intraclass correlation - A discussion and demonstration of basic features

PloS One
David LiljequistKirsti Skavberg Roaldsen

Abstract

A re-analysis of intraclass correlation (ICC) theory is presented together with Monte Carlo simulations of ICC probability distributions. A partly revised and simplified theory of the single-score ICC is obtained, together with an alternative and simple recipe for its use in reliability studies. Our main, practical conclusion is that in the analysis of a reliability study it is neither necessary nor convenient to start from an initial choice of a specified statistical model. Rather, one may impartially use all three single-score ICC formulas. A near equality of the three ICC values indicates the absence of bias (systematic error), in which case the classical (one-way random) ICC may be used. A consistency ICC larger than absolute agreement ICC indicates the presence of non-negligible bias; if so, classical ICC is invalid and misleading. An F-test may be used to confirm whether biases are present. From the resulting model (without or with bias) variances and confidence intervals may then be calculated. In presence of bias, both absolute agreement ICC and consistency ICC should be reported, since they give different and complementary information about the reliability of the method. A clinical example with data from the literature...Continue Reading

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Citations

Sep 23, 2020·Physiotherapy Theory and Practice·Amin Nakhostin-AnsariScott Hasson
Feb 12, 2020·Neurocritical Care·Andrea MorottiEnrico Fainardi
Jul 15, 2020·International Journal of Environmental Research and Public Health·Soo-Bin KimJi- Youn Kim
Jul 4, 2020·Journal of Neuroengineering and Rehabilitation·Leif E R SimmatisStephen H Scott
May 21, 2020·International Journal of Environmental Research and Public Health·Jacek TarnasRafał Stemplewski
Aug 23, 2020·International Journal of Environmental Research and Public Health·Chunxi HuangShuping Xiong
Jul 31, 2020·Scientific Reports·Christoph HaarburgerDorit Merhof
Dec 10, 2020·Scientific Reports·Claudia AmmannGuglielmo Foffani
Oct 18, 2020·Journal of Hepatology·José Ferrusquía-AcostaVirginia Hernández-Gea
Jan 7, 2021·Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland·Vincent BrissetteMarylise Boutros
Feb 3, 2021·International Journal of Rheumatic Diseases·Fardina MalikLisa A Mandl
Dec 16, 2020·Movement Ecology·Elisa PlazioPiotr Nowicki
Nov 25, 2020·International Journal of Environmental Research and Public Health·Łukasz RadzimińskiPaul Dragos
Jan 8, 2021·International Journal of Antimicrobial Agents·Tuan V Nguyen
Mar 12, 2021·International Journal of Audiology·Vinaya ManchaiahSpoorthi Thammaiah
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Apr 17, 2021·The European Journal of Health Economics : HEPAC : Health Economics in Prevention and Care·Asrul Akmal ShafieNoor Syahireen Mohammed

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Software Mentioned

SPSS
SIMANOVA
ICC

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