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Hi Harvey, thank you very much for your quick reply. How would you then specify the slopes? As fixed? Because content-wise it makes sense to propose that time of day (Level 1) influences the relationship between a day-spefic variable (e.g., sleep quality during the previous night; Level 2) and momen...

We have a three-level model with time-of-day (binary: morning versus afternoon, Level 1) nested in days (Level 2) nested in persons (Level 3). We want to test a cross-level interaction with the Level-1 variable moderating the relationship between a Level-2 predictor variable and the Level-1 outcome ...