Obama 77.9 24.8 N 47 34 Selected Control McCain 25.6 81.4 Obama 82.0 24.6 N 68 63 All Self-Selectors McCain 26.5 79.5 Obama 80.3 24.7 N 115 97 Treatment Effects McCain average (95% CI) -3.5 (-13.0, 6.0) -2.1 (-9.6, 5.4) selectors, non-selectors -10.0, 1.0 -5.0, -0.6 Obama average (95% CI) 4.2 (-5.1, 13.5) -5.5 (-16.2, 5.1) selectors, non-selectors 8.8, 1.0 -9.4, -3.4 Figure 1. The Self-Selection Experiment and Heterogeneity Distributions and Expected Means for response variable Y: fY,SC selected control (n) 𝛼 self-selection 1-𝛼 p1 fY,ST selected assignment treatment (s) random
Obama N 77.9 47 24.8 34 Selected Control McCain Obama N 25.6 82.0 68 81.4 24.6 63 All Self-Selectors McCain Obama N 26.5 80.3 115 79.5 24.7 97 Treatment Effects McCain average (95% CI) selectors, non-selectors Obama average (95% CI) selectors, non-selectors -3.5 (-13.0, 6.0) -10.0, 1.0 4.2 (-5.1, 13.5) 8.8, 1.0 -2.1 (-9.6, 5.4) -5.0, -0.6 -5.5 (-16.2, 5.1) -9.4, -3.4 Figure 1. The Self-Selection Experiment and Heterogeneity Distributions and Expected Means for response variable Y: fY,SC 𝛼 selected control (n) self-selection random assignment p1 1-𝛼 fY,ST selected treatment (s)