what statistical test to use for repeated measures
Repeated measures design 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.[10] These issues can result in sampling bias and inflated rates of Type I error.[11] In such cases it may be better to consider use of a linear mixed model.[12]