Topic: Testing Fixed and Random Effects

Deriving Mixture Weights for Correlated Variance Components

Deriving the Half-at-Zero, Half-Chi-Square Reference Law

Constructing Likelihood-Ratio Statistics from GLMM Fits

Covariance Parameters When a Variance Is Zero

Confidence Intervals by Inverting Fixed-Effect Tests

Confidence Sets for Variance Components at Zero

Boundary Tests with Small Numbers of Clusters

A Decision Framework for Fixed- and Random-Effect Tests