Fitting Linear Mixed-Effects Models using lme4
Douglas Bates, Martin Mächler, Ben Bolker, Steve Walker 3 In a linear mixed model it is the conditional distribution of Y given B = b that has such a form, (Y|B = b) ∼ N(Xβ +Zb+o,σ2W−1), (2) where Z is the n×q model matrix for the q-dimensional vector-valued random-effects variable, B, whose value we are fixing at b.The unconditional distribution of B is also multivariate
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