Abstract
This article considers sample size determination for designing multiple comparisons with respect to components of a linear function of mean vectors from Np . We propose a two-stage procedure to determine the sample size so that multiple comparisons confidence intervals will cover the true parameters and be sufficiently narrow with a guaranteed high accuracy. Appropriate formulas of design constant involved in the two-stage procedure are provided and tabulated for Tukey's method of all pairwise multiple comparisons, Hsu's method of multiple comparisons with the best, and Dunnett's method of multiple comparisons with a control. An advantage of the proposed procedure is to guarantee a high probability of simultaneous confidence intervals for treatment contrasts as well as maintaining a prespecified width when 's are unknown but spherical models.
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