<Li> Multivariate Test--This test does not assume sphericity, but is also highly conservative . </Li> <P> One of the most commonly reported effect size statistics for rANOVA is partial eta - squared (η). It is also common to use the multivariate η when the assumption of sphericity has been violated, and the multivariate test statistic is reported . A third effect size statistic that is reported is the generalized η, which is comparable to η in a one - way repeated measures ANOVA . It has been shown to be a better estimate of effect size with other within - subjects tests . </P> <P> rANOVA is not always the best statistical analysis for repeated measure designs . The rANOVA is vulnerable to effects from missing values, imputation, unequivalent time points between subjects and violations of sphericity . These issues can result in sampling bias and inflated rates of Type I error . In such cases it may be better to consider use of a linear mixed model . </P>

What statistical test to use for repeated measures