How can I analyze a design where the sample is randomly divided into three groups? Each group receives one of three treatments and dependent variables are measured. Then, a second trial is conducted where each group is administered a different treatment than they received the first time, and dependent variables are measured. The same procedure is followed a third time.
I have been told that this is a repeated measures design. However, the only examples of repeated measures I can find like this involve the same treatments over time, and between subjects (group) differences are compared.
I need a SAS code to partial out the repeated measures part of the SSEs.