The LinMix Variance Structure tab specifies the Z, G, and R matrices defined in the “General linear mixed effects model” introduction. There may be zero, one, or more random effects but only one repeated effect may be specified. The Repeated effect specifies the R=Var(e). The Random effects specify Z and the corresponding elements of G=Var(g).
Multiple random effects vs. multiple effects on one random effect
Covariance structure types in the Linear Mixed Effects object
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