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. Author manuscript; available in PMC: 2018 Apr 23.
Published in final edited form as: Biometrics. 2015 Sep 22;72(1):39–45. doi: 10.1111/biom.12412

Table 1.

Empirical type I error rate and power of each method obtained from 1000 replicates with nominal significance level of 0.05.

Sample size Test Type I error rate Power
(a) (b) (c) (d)
n1 = n2 = n3 = 50 U 0.048 0.281 0.289 0.132 0.044
V 0.043 0.036 0.079 0.845 0.721
UV 0.047 0.187 0.244 0.832 0.628
LR 0.048 0.273 0.310 0.185 0.066
GW 0.052 0.235 0.268 0.449 0.215

n1 = n2 = n3 = 100 U 0.047 0.545 0.495 0.301 0.072
V 0.036 0.049 0.137 0.995 0.965
UV 0.054 0.431 0.464 0.995 0.935
LR 0.051 0.533 0.521 0.349 0.092
GW 0.053 0.469 0.479 0.777 0.356