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Glynn, Adam N.; Ichino, Nahomi – Sociological Methods & Research, 2016
We delineate the underlying homogeneity assumption, procedural variants, and implications of the comparative method and distinguish this from Mill's method of difference. We demonstrate that additional units can provide "placebo" tests for the comparative method even if the scope of inference is limited to the two units under comparison.…
Descriptors: Comparative Analysis, Research Methodology, Causal Models, Inferences