SF = 1 SF = 2 SF = 4 SF = 10 Raised-risk area θ= 1.5 θ= 2 θ= 3 θ= 1.5 θ= 2 θ= 3 θ= 1.5 θ= 2 θ= 3 θ= 1.5 θ= 2 θ= 3 Simu 1  10% area (E = 0.84) 0 0 0.05 0 0.02 0.35 0 0.04 0.56 0 0.31 0.54  25% area (E = 1.10) 0 0.02 0.20 0 0.01 0.30 0 0.16 0.72 0.06 0.53 0.98  50% area (E = 1.92) 0 0.02 0.33 0 0.10 0.77 0 0.51 0.98 0.05 0.94 1  75% area (E = 5.37) 0 0.02 0.51 0 0.18 0.90 0 0.67 0.99 0.10 0.98 1  90% area (E = 7.38) 0 0.05 0.55 0 0.19 0.93 0 0.68 0.99 0.14 0.98 1 Simu 2  1% cluster (Ē = 5.42) 0.02 0.10 0.86 0.01 0.46 0.99 0.05 0.95 1 0.47 1.00 1.00 Simu 3 θ* = 1.35 θ* = 1.65 θ* = 2.1 θ* = 1.35 θ* = 1.65 θ* = 2.1 θ* = 1.35 θ* = 1.65 θ* = 2.1 θ* = 1.35 θ* = 1.65 θ* = 2.1  20 × 1% clusters (Ē range: 0.77–11.6) 0.04 0.85 0.99 0.04 0.99 0.99 0.06 0.99 0.99 0.0 0.99 1.00