I have two classes of 25 students. At the beginning of the semester, they took a personality test that measured a given variable. Let's call it "competence".
Every week, each student from a particular class (class #) was paired randomly with another student from the same class and they performed a task. Then, they each (source) gave their partner (target) feedback by email, and rated the quality of each other's feedback (feedback quality).
I would like to see if "competence" has an effect on "feedback quality" while controlling for the fact that data is within-subject and that I have two classes. My dataset looks like this:
Class I Source Name I Competence I Target Name I Feedback Quality 1 I AHR I 6 I HVD I 5 2 I TGH I 3 I POL I 2 1 I HVD I 4 I AHR I 7
I am using SPSS and I understand what I am trying to do is a linear mixed model. My understanding is that competence is a "random" effect while "class" and "target" are fixed effects. Is this correct?