After performing an ANOVA and then doing post hoc tests with a Tukey HSD test is it still necessary to correct for multiple pairwise comparisons or is that done already?
Tukey HSD Test – Does the Tukey HSD Test Correct for Multiple Comparisons?
anovamultiple-comparisonspost-hoctukey-hsd-test
Best Answer
It is not necessary to correct for multiple comparisons when using Tukey's HSD. The procedure was developed specifically to account for multiple comparison and maintains experiment-wise alpha at the specified level (conventionally .05). Page 210 of Maxwell and Delaney's book on experimental design has explanations and examples of the procedure.