Using proc mixed to analyze price prediction data and seeking some assistance in the repeated clause. given that repeated id=    specifies the defining variable of the (in my case CS) matrices we are interested in the effect of thr group statement... it is our understanding that in a situation where the group statement defines a between subject variable such as group = gender    both male and female subjects would now be allotted their own R the issue is that we are also interested in group on a within subject effect (lets say trials) and are looking to evaluate matrices within the subject matrix As all of a single respondent's answers are related wedo not want 0's assumed in the off diagonals within the ID matrix My co-authors and I are considering something of the following    group = subjectid*trials OR    group = trials(subjectid) Anyone out there familiar with this problem/aware of a solution? ... View more