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Multilevel Models/Hierarchical Models

A statistical method that allows researchers to estimate separately the variance between subjects within the same setting, and the variance between settings. For example, when evaluating a school-based program it is important to know the variation of students within the same school as well as the variation of students between different schools. This ensures that when programs are evaluated, the effects are not attributed to the program when there could be underlying differences between schools or between the students in those schools.