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Intraclass correlation coefficient (ICC) measures how much quantitative values are similar or associated within groups. There exist several versions and alternative formulations of ICC. The correlation is used to assess a dataset clusteredness, agreement among raters and in other settings.

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What to do with negative ICC values? Adjust the test or interpret it differently?

For my graduation thesis I am doing a study for the test-retest reliability of the tendon thickness of a particular muscle. So this study contains one rater and 70 subjects who have been tested at two …
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