I'm working with longitudinal data, and am using the mixed models function ins SPSS to look for predictors (level-1) nested within individuals (level-2).
If I add the participant ID as "subject" and days as "repeated," in the initial dialogue box, and then go into "random effects" to pull the Participant IDs into the combination box (at the bottom), do I still have to "nest" the predictors within the individuals in the "fixed effects" / "random effects" boxes? --> predictor(participant)
Thanks a bunch!