Explained Variance in Multilevel Models
A history of effect sizes has been dealt with exhaustively in Huberty (2002), and does not bear repeating here. One thing absent from Huberty’s catalog was the use of effect size indices in multilevel analysis. It was wisely absent from Huberty’s manuscript, since there is much misconception, and even disagreement, as to the interpretation of these effects. We will quickly list some of the proposed effect size indices for use in MLM and give brief explanations as to their utility.