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Dear forum I have a question regarding assumptions of cross-classification models. Do rules or assumptions exist about the minimum required crossing between classifications? I’ll specify my question using an example: I’m using cross-classified models to investigate the effects of teachers, so I have...

Dear forum I am using cross-classified multilevel models in MLwiN to investigate effects of primary and secondary schools. In a cross-classification model, you first need to specify a ‘naïve’ hierarchical multilevel model and in a second step you need to specify your cross-classification. My questio...