Hi all, I would like to have your input regarding a scenario where multiple pairwise comparisons against a control are conducted within the context of an Heteroscedastic Two-Way repeated measures ANOVA model. Let's say I have 4 groups, group 1 is the control and I have multiple values taken for each group across time. Therefore, I would have an heteroscedastic ANOVA model with Group (4 levels), Time (let's say 6 levels) and their interaction as fixed factors. The pairwise comparisons of interest would be Group 1 vs Group 2, Group 1 vs Group 3 and Group 1 vs Group 4. My SAS mixed procedure would be as follows: PROC MIXED Data= data METHOD=REML ; CLASS Group Time Subject ; MODEL Value = Group Time Group*Time / DDFM=KR ; REPEATED Time / GRP=Group Subject=Subject TYPE=CS ;/* this could be a different covariance structure */ LSMEANS Group / PDIFF=Control("1") ADJUST= ??? ADJDFE=??? ; RUN ; I would greatly appreciate to know your input for the best approach to consider regarding the "???" that I have included in the above SAS code. Thanks
... View more