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How the Cases You Choose Affect the Answers You Get: Selection Bias in Comparative Politics

Published online by Cambridge University Press:  04 January 2017

Abstract

This article demonstrates how the selection of cases for study on the basis of outcomes on the dependent variable biases conclusions. It first lays out the logic of explanation and shows how it is violated when only cases that have achieved the outcome of interest are studied. It then examines three well-known and highly regarded studies in the field of comparative politics, comparing the conclusions reached in the original work with a test of the arguments on cases selected without regard for their position on the dependent variable. In each instance, conclusions based on the uncorrelated sample differ from the original conclusions.

Type
Research Article
Copyright
Copyright © by the University of Michigan 1991 

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