Determine the estimated variance-covariance matrix of observations y.
A linear mixed model can be written as y = Xb + Zg + e, where y is the column vector of observations, X and Z are design matrices assigning fixed (b), respectively, random (g) effects to observations, and e is the column vector of residual errors. The variance-covariance matrix of y is equal to Var(y) = ZGZ' + R, where R is the variance-covariance matrix of e and G is the variance-covariance matrix of g. Here, G is assumed to be a diagonal matrix, i.e. all random effects g are mutually independent (uncorrelated).
(VCA) object with additional elements in the 'Matrices' element, including matrix V.
Andre Schuetzenmeister andre[email protected]
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