Is the homogoneity of variance-covariance prerequisite to ANOVA a requirement? If yes, if my data failed the homogoneity of variance-covariance test, should I use a non-parametric test instead or is ANOVA robust enough to be conducted even if the data fails the homogoneity of variance-covariance test? HAIDER. =========================================================================== This list is open to everyone. Occasionally, people lacking respect for other members of the list send messages that are inappropriate or unrelated to the list's discussion topics. Please just delete the offensive email. For information concerning the list, please see the following web page: http://jse.stat.ncsu.edu/ ===========================================================================