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lOMoARcPSD|6106013Class Typed Notes - Summary of lecture
Research Design (University of Glasgow)
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, lOMoARcPSD|6106013
Research Design: Week 5- 16/10/2017
Case Selection and Small-N Research Design
Slide 2: Change of Venue
October 23: Hilton.
October 30: Hunter Hall West, Gilbert Scott Main Building.
November 6: Hunter Hall West, Gilbert Scott Main Building.
November 13: Hunter Hall West, Gilbert Scott Building.
November 20: Hunter Hall West, Gilbert Scott Building.
November 27: Hilton.
Slide 3: Assessment
Three pages of details about the assessment are now contained in the course
outline.
If there are questions, post them to the course forum on Moodle.
Posting your questions will allow other students to benefit from the answers.
Slide 4: Overview
1. Number of cases and indeterminate research designs.
2. Selection bias.
3. Mill’s case selection methods (and Lieberson’s critique).
4. Overview of case selection methods. 5. Negative case selection and the possibility
principle.
Slide 5: Indeterminate Research Designs
“Some research designs are indeterminate; that is, virtually nothing can be learned
about the causal hypotheses.” (King, Keohane and Verba 1994)
Two sources of indeterminacy:
1. More inferences than cases.
2. Multicollinearity.
Slide 6: Example one- Many Cases
Does geographic distance to the workplace explain job satisfaction?
Control variable 1: Urban or rural area.
Control variable 2: Travel time the commute takes.
Control variable 3: Salary.
Random sample of, say, 1,000 people who work. I 1,000 cases − 4 variables = 996
degrees of freedom.
Multicollinearity: Travel time and geographic distance are almost perfectly
correlated.
To distinguish between the effects of travel time and geographic distance, one would
need a sufficient number of cases in which these variables differ. This is not given;
hence the degrees of freedom are much lower than 996.
Slide 7: Example 2- Few Cases
Does the size of an ethnic minority lead to genocide?
Control variable: Economic deprivation.
Case selection:
1. Khmer Rouge in Cambodia: genocide; small minorities; economic deprivation.
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