1. Introduction -- 2. Linear mixed models : an overview -- 3. Two-level models for clustered data : the rat pup example -- 4. Three-level models for clustered data : the classroom example -- 5. Models for repeated-measures data : the rat brain example -- 6. Random coefficient models for longitudinal data : the autism example -- 7. Models for clustered longitudinal data : the dental veneer example -- 8. Models for data with crossed random factors : the SAT score example.