1. Introduction: A Science of Politics 3
2. The Logic of Research Design: Experiments and Quasi-Experiments 20
3. Measurement and Operationalization I: Variables Pertaining to Aggregate Units 58
4. Measurement and Operationalization II: Variables Pertaining to Individual Behavior 96
5. Surveys 153
6. Indexing 205
7. Content Analysis 223
8. Sampling 244
9. Rational Choice Analysis 265
10. Univariate Analysis: Statistics of a Single Variable 285
11. Bivariate Analysis: Statistics of Two Variables 306
12. Multivariate Analysis: Statistics of More Than Two Variables 321
13. Scientific Principles in Political Study: Some Enduring Controversies 365.