On various intraclass correlation reliability coefficients
Abstract
Briefly reviews the most frequently used and misused intraclass correlation--analysis of variance (ANOVA) reliability measures. Recommendations are made for the 1-way ANOVA intraclass correlation and against the use of several coefficients: B. J. Winer's (1971) so-called "anchor point method," the Kuder-Richardson Formula Number 20, and the Spearman-Brown prediction formula. The computation of the intraclass correlation coefficient via 2-way ANOVA is not encouraged. Several uses and misuses of reliability coefficients applied to dichotomous data are illustrated.