In this note, we reconsider Cohen's effect size measure $f^2$ under linear mixed models and demonstrate its application by employing an artificially generated data set. It is shown how $f^2$ can be computed with the statistical software environment R using lme4 without the need for specification and computation of a coefficient of determination.

翻译：在本文中，我们重新审视了线性混合模型下科恩效应量度量$f^2$，并通过使用人工生成的数据集展示了其应用。本文展示了如何利用统计软件环境R中的lme4包计算$f^2$，而无需指定和计算决定系数。