Comparative method

The comparative method analyzes similarities and differences across cases to identify patterns, test explanations, and clarify how conditions relate to outcomes.

Most similar systems design: A comparative research design that examines similar cases with different outcomes to isolate explanatory differences. It shows how holding many conditions steady can sharpen comparisons.
Comparative politics: The study of political systems, institutions, and processes through comparison across countries or other political units. It uses cross-case analysis to explain differences in political outcomes.
Experimental method: A research approach that manipulates conditions to test their effects under controlled circumstances. Unlike comparative studies, experiments can directly assign treatments to units.
Equivalence problem: The difficulty of determining whether concepts and measurements have the same meaning across cases. A comparison misleads when apparently matching features measure different things.
Most different systems design: A comparative research design that examines dissimilar cases sharing an outcome to identify common explanatory factors. It seeks common causes despite broad differences between cases.
Comparative historical analysis: A research approach that compares historical cases to explain large-scale social and political change. It applies structured comparison to sequences unfolding across time.
Statistical method: A set of quantitative techniques for summarizing data and estimating relationships among variables. Statistical analysis often handles many cases where comparison examines a smaller set closely.
Selection bias: Systematic distortion in findings caused by how observations or cases enter a study. Choosing cases based on outcomes can create misleading comparative patterns.
Case selection: The process of choosing cases for a study according to a research question and design. Selection determines which similarities and differences the comparison can reveal.
Comparative law: The study of similarities and differences among legal systems and legal rules. It compares institutions and doctrines across jurisdictions.

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