a0 E(β4\y,y0) (95% CrI) Pr(β4 > 0\y,y0)
0 0.57 (-0.03, 1.17) 0.97
0.25 0.64 (0.07, 1.23) 0.98
0.50 0.68 (0.12, 1.30) 0.98
0.75 0.71 (0.11, 1.35) 0.99
1 0.74 (0.11, 1.43) 0.99
Table 5: Posterior results for the period x group interaction term (β4) for EPP model under various
choices for a0