Measurement tools used in clinical studies need to be sufficiently reliable. Reliability means that the tool gives consistent results when administered by different people (interrater reliability) or at different time points (test-retest reliability). Statistical tests of association are not appropriate for assessing reliability—reliability statistics assess agreement rather than association. Reliability statistics include the Kappa statistic for categorical scales and the intraclass correlation coefficient (ICC) for continuous scales.
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Παρασκευή 9 Ιουνίου 2017
Reliability Statistics
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