in the first place.

Random slopes model

A random slopes model is a model in which slopes are allowed to vary according to a correlation matrix, and therefore, the slopes are different across grouping variable such as time or individuals. This model assumes that intercepts are fixed (the same across different contexts).

Random intercepts and slopes model

A model that includes both random intercepts and random slopes is likely the most realistic type of model, although it is also the most complex. In this model,

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