When sphericity is violated, what test statistics should be used?
A) ANCOVA
B) MANOVA
C) MANCOVA
D) None of the above

Question

Quizplus · Accepted Answer

When sphericity is violated in a repeated measures ANOVA, the Greenhouse-Geisser or Huynh-Feldt correction should be applied. However, these corrections can lead to reduced power and increased type II error rates. Therefore, a better alternative is to use a MANOVA, which does not rely on the assumption of sphericity.

When Sphericity Is Violated, What Test Statistics Should Be Used