Natural Experiments Jason Seawright
[email protected] August 11, 2010 J. Seawright (PolSci) Essex 2010 August 11, 2010 1 / 31 Typology of Natural Experiments J. Seawright (PolSci) Essex 2010 August 11, 2010 2 / 31 Typology of Natural Experiments Classic Natural Experiment J. Seawright (PolSci) Essex 2010 August 11, 2010 2 / 31 Typology of Natural Experiments Classic Natural Experiment Instrumental Variables-Type Natural Experiment J. Seawright (PolSci) Essex 2010 August 11, 2010 2 / 31 Typology of Natural Experiments Classic Natural Experiment Instrumental Variables-Type Natural Experiment Regression-Discontinuity Design J. Seawright (PolSci) Essex 2010 August 11, 2010 2 / 31 Bolstering Understand assumptions. J. Seawright (PolSci) Essex 2010 August 11, 2010 3 / 31 Bolstering Understand assumptions. Explore role of qualitative evidence. J. Seawright (PolSci) Essex 2010 August 11, 2010 3 / 31 Classic Natural Experiment J. Seawright (PolSci) Essex 2010 August 11, 2010 4 / 31 Classic Natural Experiment 1 “Nature” randomizes the treatment. J. Seawright (PolSci) Essex 2010 August 11, 2010 4 / 31 Classic Natural Experiment 1 “Nature” randomizes the treatment. 2 All (observable and unobservable) confounding variables are balanced between treatment and control groups. J. Seawright (PolSci) Essex 2010 August 11, 2010 4 / 31 Classic Natural Experiment 1 “Nature” randomizes the treatment. 2 All (observable and unobservable) confounding variables are balanced between treatment and control groups. 3 No discretion is involved in assigning treatments, or the relevant information is unavailable or unused. J. Seawright (PolSci) Essex 2010 August 11, 2010 4 / 31 Classic Natural Experiment 1 “Nature” randomizes the treatment. 2 All (observable and unobservable) confounding variables are balanced between treatment and control groups.