Model Dimension

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

The fixed 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 WEEK, independently for each of the 351 customers in the study.

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