Political Science Scope and Methods Case Studies, Comparing Cases, and Statistical Analysis.

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Presentation transcript:

Political Science Scope and Methods Case Studies, Comparing Cases, and Statistical Analysis

Cases: From few to many Last week: Experiments This week: Everything else Overview  Case studies: what are they good for?  Comparative method  Large N analysis

The logic of Degrees of Freedom Lijphart: small-N analysis a way-station on the road to large-N studies What does more cases buy us? Degrees of freedom  Need as much (if not more) information as inferences  Like equations and unknowns problem in algebra

Case Studies What are case studies good for?  Theory generation?  Theory testing: Process Tracing (Van Evera) Break down causal links; look for evidence Multiple tests in a single case (?) Congruence Paradigm Compare values of IV and DV to “normal” values Getting comparative…

Comparative Method Controlled comparison of cases  Van Evera – skeptical  Other authors – advocates How do you pick cases to make the strongest inferences?  How do you design a “strong test”?  Case selection (more next week)

Strategies of Controlled Comparison Most different vs. most similar “Method of difference”  Select cases that are as similar as possible except in their value on the IV of interest “Method of agreement”  Select cases that similar on IV, but different in other ways

Case Study Example: Silent Voices (the book) Examine interaction between individual survey response and political context Look at effects of changes in context Case studies: 3 issue areas, 6 cases (and 3-12 observations within each case) Example: Racial policy questions:  “Method of difference”  “Method of agreement.”

Yes Don’t Know Response 2: Opinion Withholding Are there costs associated with the free expression of opinion? Are there particular benefits to answering the survey question? YesNo Respondent Reveals Opinion: Opinion expressed is the same as opinion formed Opinion Expression Opinion Formation YesNo Can the respondent easily form an opinion? Don’t Know Response 1: Absence of Coherent Evaluation Respondent evaluates target Can respondent construct a representation of target object? YesNo Respondent Edits Opinion: Opinion expressed is not the same as opinion formed, but respondent answers question

Typology of Issue Difficulty

Case Selection

School 1972 Employment 1972 School 1990 School 1992 School 1994 Employment 1992 School 1972 Employment 1972A School 1990DD School 1992DDA School 1994 DDAA Employment 1992DDAAA Case Selection: Racial Policy Issues

Large N (Statistical) Analysis Internal vs. External validity tradeoff  Be mindful of C&S’s threats to Quasi- Experiments Questions of robustness  In random data 5% of relationships appear significant  Account for competing theories  Look at independent data sets

Large N (Statistical) Analysis (Cont.) Be honest about results  Report uncertainty Art and science

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