Are ANOVA assumptions met: normally distributed Y; equal population variances; independently sampled populations?
As in all statistical models, the ANOVA model has assumptions that should be thought of as requirements. When requisite assumptions are not met, in most cases a work-around analytical solution is available. The difficult part, most often, is determining when to use a work-around solution and when the ANOVA is appropriate. This section provides guidance on how to determine the appropriateness of the ANOVA assumptions, and what to do if the assumptions are not met.
