The percent variance explained can be interpreted as the intra-class correlation (ICC). Consider the simplest example of the i th sample from the k th individual 9\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\begin{array}{@{}rcl@{}} y_{i,k} &=& \mu + \alpha_{k} + \varepsilon_{i,k} \end{array} $$ \end{document}yi,k=μ+αk+εi,k
