Hello, I want to do multilevel analysis - and I have encountered a problem.
I want to do an analysis about happiness level of students in class 1 elite class,
BUT in my analysis, perception of class 2 students, non-elite students about elite student in class 1 will be one of the predictors.

The perception about class 1 by class 2 will be made with the code:

egen group_perception=median(perception) if class==2

as the group_perception variable was made by the students in class 2, when I tried to use it in the multilevel analysis, the error : no observation occurs - which is not very surprising considering that the group_perception variable was only made with the students in class 2 and I am running multilevel analysis with the students in class 1.

How would I be able to solve this problem? Thanks.