Table II.
Simulation results: empirical power of IWD and LR tests with size 0.05. 1000 iterations, β = 0.75 (hazard ratio = 2.12), M = 4, n1 = n2 = n3 = n, ϕ2 = ϕ3 when G = 3, 97% censoring when Z = 1 and 86% censoring when Z = 0 or no censoring.
| n. | True {ϕ1, ϕ2} | Modeled ϕ | 2 groups w = 1 |
2 groups w* |
2 groups LR |
3 groups w = 1 |
3 groups w* |
3 groups LR |
|---|---|---|---|---|---|---|---|---|
| 100 | (no censoring) | 0.966 | 0.972 | 0.976 | 0.982 | |||
| −log(2), −log(2) | Truth | 0.860 | 0.860 | 0.850 | 0.909 | 0.900 | 0.907 | |
| CAR | 0.638 | 0.668 | 0.601 | 0.697 | 0.723 | 0.684 | ||
| −log(2), 0 | Truth | 0.810 | 0.837 | 0.785 | 0.867 | 0.884 | 0.865 | |
| CAR | 0.929 | 0.939 | 0.912 | 0.970 | 0.976 | 0.963 | ||
| −log(2), log(2) | Truth | 0.756 | 0.784 | 0.750 | 0.820 | 0.841 | 0.823 | |
| CAR | 1.000 | 1.000 | 0.999 | 1.000 | 1.000 | 1.000 | ||
| 200 | (no censoring) | 0.999 | 0.999 | 1.000 | 1.000 | |||
| −log(2), −log(2) | Truth | 0.993 | 0.989 | 0.991 | 0.998 | 0.998 | 0.999 | |
| CAR | 0.916 | 0.931 | 0.893 | 0.953 | 0.968 | 0.941 | ||
| −log(2), 0 | Truth | 0.973 | 0.979 | 0.971 | 0.992 | 0.994 | 0.988 | |
| CAR | 0.996 | 0.997 | 0.996 | 0.999 | 0.999 | 0.997 | ||
| −log(2), log(2) | Truth | 0.961 | 0.973 | 0.959 | 0.982 | 0.991 | 0.985 | |
| CAR | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | ||
| 500 | (no censoring) | 1.000 | 1.000 | 1.000 | 1.000 | |||
| −log(2), −log(2) | Truth | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | |
| CAR | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | ||
| −log(2), 0 | Truth | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | |
| CAR | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | ||
| −log(2), log(2) | Truth | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | |
| CAR | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |