I am trying to follow these instructions to perform a Repeated Measures ANOVA. The example is from a book entitled, Design and Analysis by G. Keppel. Pages 414-416.   According to the instructions, "This example contains eight subjects (sub) with one between-subjects IV with two levels (group) and one within-subjects IV with four levels (indicated by position dv1–dv4)."   I don't have access to the book. What does dv1-dv4 refer to? It is the dependent variable at time points 1-4? I'm assuming that's the case, but I'm confused by the reference to it as a "within-subjects" independent variable. PROC GLM DATA=wide; CLASS group; MODEL dv1-dv4 = group / NOUNI ; REPEATED trial 4; RUN; What is "trial" in the REPEATED statement? Obviously the "4" refers to the 4 time points (i.e., levels).   I am simply preparing for the analysis. I don't have the data yet, so I don't know which format the data will be in (i.e., wide v long).   Also, I'm going to need some help interpreting the output. Any suggested resources would be appreciated.    Thanks! ... View more

I am designing a prospective study w/ one group of participants. Continuous outcome variables will be measured at 3 points in time (i.e., baseline, timepoint_1, timepoint_2). The statistical analysis will likely be a paired t-test, two-way ANOVA, repeated-measures ANOVA, or something in that ballpark. There is also a possibility this will be collapsed into a simple pre/post study. TBD. Feedback on the analysis is also welcome.   Among other things, I'm assuming I will need a mean score - as a separate variable - for each time point  (i.e., baseline_mean, timepoint_1_meanscore, timepoint_2_meanscore).   Am I correct? If so, what is the best way to accomplish this?   A small sample dataset attached. I'm a beginner-intermediate SAS programmer.    Thank you.      ... View more