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

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Regime Change and Revolutionary Entrepreneurs (2010, background): “Geddes (1990) critiques this claim by noting that in other settings, international pressure does not seem to cause revolution.”
Does Internet Use Affect Engagement? A Meta-Analysis of Research (2009, background): “Sampling on the dependent variable, e.g., political interest (or in Kaye and Johnson (2002) on Internet use), may bias the results towards finding no effects, when an effect does exist (Geddes, 1990; King, Keohane, & Verba, 1994).”
Explaining Variation In The Success Of Extreme Right Parties In Western Europe (2003, background): “The fact that selection bias can seriously damage one’s ability to make valid causal inferences is increasingly well understood and accepted (Geddes, 1990; Heckman, 1979; Przeworski & Limongi, 1992).”