Great question, and one that doesn’t come with a simple answer: it depends on how much it is violated, what the DV is, and whether the measurement would likely be robust to the violation. The basic answer is, use the nonparametric alternative to this parametric test.
What should we do if the homogeneity is violated?
Great question, and one that doesn’t come with a simple answer: it depends on how much it is violated, what the DV is, and whether the measurement would likely be robust to the violation. The basic answer is, use the nonparametric alternative to this parametric test.