Cheung and Holland (1992) extended Dunnett's procedure for comparing all active treatments with a control simultaneously within each of r groups while maintaining the Type I error rate at some designated level α allowing different sample sizes for each of the group-treatment categories. This paper shows that exact percentage points can be easily calculated with current available statistical software (SAS). This procedure is compared to resampling techniques and a Bonferroni corrected Dunnett-within-group procedure by means of a simulation study.
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Biesheuvel et al. (2002) studied this question.
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