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Suppose that in a study, time collection proceeds in 8 waves: 0(baseline), 1,2,3,5,7,9,12 months. Let Yi denote the vector of observed responses for a subject

Suppose that in a study, time collection proceeds in 8 waves: 0(baseline), 1,2,3,5,7,9,12 months. Let Yi denote the vector of observed responses for a subject who missed second and fifth waves of data collection. State the covariance matrix for Yi under AR(1), CS and unstructured structure. Explain each of the terms used in your notation?

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