![]() ![]() test from R perform pairwise comparisons. The Bonferroni, however, is a good general procedure. Gives shorter confidence intervals than either Bonferroni or Scheffe.5 ⎟ = ⎠ ⎞ ⎜ ⎝ ⎛ ⎟⎟ = ⎠ ⎞ ⎜⎜ ⎝ ⎛ s s − α % The denominator of the first term in the Bonferroni Correction the number of possible comparisons in a given sample. The detailed answer is that the Tukey HSD is a proper "post hoc" test whereas the Bonferroni test is for planned comparisons. Let's say we have 5 means, so a = 5, we will let α = 0. If you are looking at all pairwise comparisons then Tukey's exact procedure is probably the best procedure to use.
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