Anova questions

Saif,
Levene’s test checks the homogeneity of variance assumption, not the normality assumption.
If Levene’s test shows that your data violates the homogeneity of variance assumption, then you have the following choices:
– make sure that the homogeneity of variance assumption isn’t being being violated because of outliers; if so you need to deal with the outliers first
– perform a one-way analysis instead using Brown-Forsythe or Welch’s test, which do not require homogeneity of variances
– transform the data to try to eliminate the problem. Typical transformations are log(x), x^2, 1/x
Charles

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