Fig. 3From: Estimation of an inter-rater intra-class correlation coefficient that overcomes common assumption violations in the assessment of health measurement scalesEmpirical variance of scores Compares the mean variance, binomial variance, and the observed variance (using a smoothing spline with 10 degrees of freedom) of Observer OPTION5 score. Highlights the heteroscedasticity of the variance as a function of the meanBack to article page