When doing multiple comparisons, which method is the most powerful?
A) planned comparisons
B) Scheffé test
C) the HSD test
D) they are all equally powerful

Question

Quizplus · Accepted Answer

Planned comparisons allow for specific, predetermined comparisons to be made with increased power and reduced Type I error rates. The other methods (Scheffé test and HSD test) are more conservative and are intended to control for overall Type I error rates when performing multiple comparisons.

When Doing Multiple Comparisons, Which Method Is the Most Powerful