Pairwise Multiple Comparisons in the Unequal Variance Case
通过计算机模拟比较了四种在组间方差不等时使用的成对多重比较方法，发现其中三种方法具有保守性，并比较了它们的置信区间长度。
Abstract Four pairwise multiple comparison procedures for the case in which the variances in the groups are unequal were compared by computer simulation: the GH procedure based on the Studentized range and the Welch formula for approximate degrees of freedom (df), the C procedure based on a weighted average of two Studentized range points, the T2 procedure based on Student's t, and the T3 procedure based on the Studentized maximum modulus. The results indicate that C, T2, and T3 have the desirable property of being conservative, whereas GH sometimes is not. Of the three conservative procedures, T3 always has shorter confidence interval length than T2, whereas C has shorter length than T3 for large df, but longer length for small df.