The Variance Structure tab allows setting random effects and the repeated specification for the model. Traditional variance components and random coefficients can also be set.
Specify none, one, or multiple random effects. The random effects specify Z and the corresponding elements of G=Var(g). Only one repeated effect can be defined. The repeated effect specifies the R=Var(e).
The random effects model can be created using the classification variables.
Use the pointer to drag the variables from the Classification Variables box to Random 1 tab.
Type variable names in the fields in the Random 1 tab.
The random effects model can also be created using the regressor or covariate variables.
Use the pointer to drag the variables from the Regressors/Covariates box to Random 1 tab.
Type variable names in the fields in the Random 1 tab.
For more on variance structures in the linear mixed effects model, see the “Variance structure” section.