Model Dimension

Figure 1. Model Dimension for unstructured covariance model
Model Dimension for unstructured covariance model

The fixed and random effects for this model are identical to those from the First-Order Autoregressive model. The First-Order Autoregressive covariance structure is replaced with an Unstructured one, which requires 10 parameters -- 8 more than the First-Order Autoregressive. This covariance structure is again applied to the levels of LOCID*MARKETID, independently for each of the 133 store locations in the study.

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