Dong, Nianbo, Jessaca Spybrook, Ben Kelcey, and Metin Bulus. “Power Analyses for Moderator Effects With (Non)Randomly Varying Slopes in Cluster Randomized Trials”. Methodology 17, no. 2 (June 30, 2021): 92-110. Accessed April 19, 2024. https://meth.psychopen.eu/index.php/meth/article/view/4003.