Table of Contents 1. Introduction 2. Model specification and estimation 3. Basic count regression 4. Generalized count regression 5. Model evaluation and testing 6. Empirical illustrations 7. Time series data 8. Multivariate data 9. Longitudinal data 10. Endogenous regressors and selection 11. Flexible methods for counts 12. Bayesian methods for counts 13. Measurement errors.