2/14/2023 0 Comments Anova xlstatThe test can also be used when the group means are not equal viaĪlthough, since Dunnett’s Table is based on equal group sizes, the above formula is only accurate if the group sizes are not too different. The table contains the values t d( k, df W, α) where k = the number of groups (treatments) including the control. Where n = size of the group samples, x̄ o = mean of the control group, x̄ j is the mean of any other group and t dis the (two-tailed) Dunnett’s critical value given in the Dunnett’s Table. The test is similar to Tukey’s HSD, except that instead of testing In this case, Dunnett’s test is more powerful than the other ANOVA post-hoc tests described on this website. Dunnett’s test is used when we want to compare one group (usually the control treatment) with the other groups.
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