I set up a multilevel model in R with the lme4-package to test different effects on social participation in primary school classes. Now I assume that the effects of academic performance (sp) and emotional-social competence (es) vary between classes, which is why I set up a model with random effects. Now I want to test those random slopes.
This is my model (don’t wonder, In my model, other variables – such as gender, migration background and the teacher’s attitude – are included):