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

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

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

Understanding Confidence Intervals for lmer Models: A Practical Approach to Avoiding NA Values

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