counterfactual

Experiments TIG Week: Laura Peck on How I Learned to Love the Counterfactual Laura Peck

I’m Laura Peck, recovering professor and now full-time evaluator with Abt Associates.  For many years I taught graduate Research Methods and Program Evaluation courses. One part I enjoyed most was introducing students to the concepts of causality, internal validity and the counterfactual – summarized here as hot tips. Hot Tips: #1:  What is causality? Correlation …

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Experiments TIG Week: Melinda Davis on Research Designs and the Control Group Problem

I am Melinda Davis, a Research Assistant Professor at the University of Arizona in Psychology, coordinate the Program Evaluation and Research Methods minor, and serve as Editor-in-Chief for the Journal of Methods and Measurement in the Social Sciences.  In an ideal world, evaluation studies compare two groups that differ only on the treatment assignment.  Unfortunately, …

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