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

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

Fitting GMM Models Using the GMMAT Package in R and Extracting Fit Statistics Including AIC, R2, and P-Values.

Model Comparison and Coefficients Analysis for GLMMs: Which Model Provides the Best Fit?

Solving Errors with the $ operator in R: A Step-by-Step Guide Using the nonnest Package