Skip to main content
. Author manuscript; available in PMC: 2009 Dec 21.
Published in final edited form as: Stat Med. 2008 Dec 10;27(28):5861–5879. doi: 10.1002/sim.3397

Table I.

Simulation results: empirical size of integrated weighted difference (IWD) and logrank (LR) tests with nominal size 0.05. 1000 iterations, M = 4, n1 = n2 = n3 = n., ϕ2 = ϕ3 when G = 3, no censoring or 86% censoring.

n. True {ϕ1, ϕ2} Modeled ϕ 2 groups
w = 1
2 groups
w*
2 groups
LR
3 groups
w = 1
3 groups
w = w*
3 groups
LR
100 (no censoring) 0.054 0.061 0.055 0.064
−log(2), −log(2) Truth 0.043 0.038 0.048 0.043 0.042 0.059
CAR 0.055 0.056 0.066 0.063 0.060 0.075
−log(2), 0 Truth 0.050 0.058 0.048 0.052 0.052 0.057
CAR 0.129 0.127 0.131 0.128 0.131 0.137
−log(2), log(2) Truth 0.058 0.059 0.062 0.050 0.054 0.061
CAR 0.311 0.292 0.297 0.311 0.306 0.304
200 (no censoring) 0.054 0.055 0.055 0.059
−log(2), −log(2) Truth 0.044 0.044 0.036 0.049 0.054 0.051
CAR 0.060 0.059 0.059 0.054 0.058 0.054
−log(2), 0 Truth 0.055 0.052 0.051 0.072 0.071 0.066
CAR 0.208 0.201 0.209 0.197 0.198 0.204
−log(2), log(2) Truth 0.053 0.052 0.058 0.052 0.055 0.050
CAR 0.500 0.490 0.464 0.528 0.518 0.511
500 (no censoring) 0.050 0.049 0.052 0.054
−log(2), −log(2) Truth 0.054 0.052 0.053 0.062 0.062 0.061
CAR 0.045 0.043 0.050 0.061 0.059 0.059
−log(2), 0 Truth 0.054 0.056 0.056 0.059 0.060 0.063
CAR 0.389 0.377 0.366 0.364 0.364 0.365
−log(2), log(2) Truth 0.047 0.048 0.049 0.034 0.035 0.040
CAR 0.891 0.880 0.863 0.917 0.909 0.894