a0 E(β4\y,y0) (95% CrI) Pr(β4 > 0\y,y0)
0 0.57 (-0.03, 1.17) 0.97
0.25 0.62 (0.11, 1.18) 0.98
0.50 0.69 (0.15, 1.22) 0.99
0.75 0.78 (0.25, 1.30) 1.0
1 0.89 (0.36, 1.47) 1.0
Table 3: Posterior results for the period x group interaction term (β4) under various choices for a0.