when to test for sphericity of variance how to test for difference between groups over time how to measure the sphericity of variance of an experiment test for homogeneity of variance when n is less than number of levels how is homogeneity tested can n be less than number of levels in a control group can you test for heterogeneity how to test for differences between groups over time how do you check differences between experimental groups when p value is less than n what does this mean when to test for sphericity in an anova when n is less than the number of levels does sphericity start if n is less than the number of levels in spss how many experiments how to test for differences between experimental groups over time how do i test for sphericity can you test for differences between groups? how often does difference of experimental groups occur can you test for differences between groups over time when n is less than the number of levels does n determine the level of homogeneity of variance if n is less than the number of levels, do the experiments have to be repeated