Estimating Confidence Intervals for Fixed Effects in Generalized Linear Mixed Models Using bootMer: The Role of Random Effects and Alternative Methods.

Double Cross-Classified 3-Level Hierarchical Linear Models in R: A Comprehensive Guide

Understanding and Addressing the "Number of Levels" Error in Linear Mixed-Effects Models

Accessing Elements of an lmer Model: A Comprehensive Guide to Mixed-Effects Modeling with R

Understanding Residual Variance in Linear Mixed Effects Models Using R's lme4 Package