Thank you so much for your answer! But I still don't understand. A saturated model has as many parameters as it has datapoints. In fact, I have 1200 oberservations, one dependent variable and six indipendent variables. It is a twolevel analysis with five predictors on level 1 and one predictor on level 2. So it should not be saturated! Or is there something I don't get?
I have a question regarding multilevel analysis. We conducted a diary study in which we measured all variables at the within-person level, so there are no variables that should be modeled at the between-person level. However, since the data is nested within the persons (N = 47, and days = 214) we want to use multilevel analysis. Should we specify a model (the same model) at both levels when using type is twolevel, even though we did not measure anything on the between-level?