Mixed Model Repeated Measures (MMRM)
Proc Mixed | Covariance Structures In the first-order autoregressive structure (TYPE =AR(1)), measurements taken at adjacent time points (e.g. consecutive visits) have the same correlation such as ρ. The correlation of ρ2 is assigned to measurements that are 2 visits apart; ρ3, to measurements that are 3 visits apart, etc. -
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