This book provides a simple, intuitive introduction to regression models for qualitative and discrete dependent variables, to sample selection models, and to event history models, all in the context of maximum likelihood estimation. Coverage extends to a wide range of commonly used models. The book enables the reader to be a more critical consumer of current empirical social science research and to conduct original empirical analyses. It can be used as a textbook for an advanced undergraduate, Masters or first-year Ph.D. course in microdata analysis, as a supplementary text to an applied microeconomics field course, or as a practical reference for practitioners and researchers. The book includes numerous examples, illustrations, and exercises.