Module 3.4: Nested vs non-nested random effects
Required:
Lecture Notes on Hierarchical Modeling by Peter D. Hoff.:
Section 7.2: Non-nested grouping factors
Section 7.3: Multiple nested grouping factors
Optional:
Data Analysis Using Regression and Multilevel/Hierarchical Models
by Gelman A., and Hill, J.:
Section 13.5: Non-nested models
Section 13.7: More complex multilevel models