When sphericity is violated in a one-way within subjects ANOVA design,how do you proceed?
A)Explore other methods of analyzing the data besides ANOVA,because ANOVA won't work properly.
B)Interpret the Greenhouse-Geisser and/or Huynh-Feldt statistics,because they adjust for lack of sphericity.
C)Use a more liberal (i.e.,higher)alpha level to compensate for the violation.
D)Collect more data.

Question

Quizplus · Accepted Answer

When sphericity is violated in a one-way within subjects ANOVA design, the Greenhouse-Geisser or Huynh-Feldt statistics should be used to adjust for lack of sphericity. These statistics will adjust the degrees of freedom downward, resulting in a more conservative analysis. Other options, such as exploring other methods of analysis or using a more liberal alpha level, are not ideal solutions for addressing violations of sphericity. Collecting more data may improve statistical power, but does not address the issue of sphericity.

When Sphericity Is Violated in a One-Way Within Subjects ANOVA