Fitting Linear Mixed-Effects Models using lme4
The unconditional distribution of B is also multivariate normal with mean zero and a parameterized q ×q variance-covariance matrix, Σ, B ∼ N(0,Σ). (3) As a variance-covariance matrix, Σ must be positive semidefinite. It is convenient to express the model in terms of a relative covariance factor, Λθ, which is a q ×q matrix, depending on
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