Mixed ANOVA: Overcoming Errors When Working with Alphabetic Variables in R

Resolving the "Error in diag(Lambert) : object 'R_sparse_diag_get' not found" Error in lmer Models: Causes and Solutions

Understanding Mixed Models with lme4: The Importance of Starting Values for lmer

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

Converting Scaled Predictor Coefficients to Unscaled Values in LMER Models Using R