Propensity Score Analysis provides readers with a systematic review of the origins, history, and statistical foundations of PSA and illustrates how to use PSA methods for solving evaluation problems. With a strong focus on practical applications, the authors explore various types of data and evaluation problems, strategies for using the methods, and the limitations of PSA. Unlike the existing textbooks on program evaluation, Guo and Fraser's Propensity Score Analysis delves into statistical concepts, formulas, and models underlying the application of PSA.