User Guide

54
Chapter 4
Linear Mixed Models EM Means
Figure 4-7
Linear Mixed Models: EM Means dialog box
Estimated Marginal Means of Fitted Models. This group allows you to request model-
predicted estimated marginal means of the dependent variable in the cells and their
standard errors for the specified factors. Moreover, you can request that factor levels of
main effects be compared.
 Factor(s) and Factor Interactions. This listbox contains factors and factor
interactions that have been specified in the Fixed dialog box, plus an
OVERALL
term. Model terms built from covariates are excluded from this listbox.
 Display Means for. The procedure will compute the estimated marginal means for
factors and factor interactions selected for this listbox. If
OVERALL is selected, the
estimated marginal means of the dependent variable are displayed, collapsing over
all factors. Note that any selected factors or factor interactions remain selected
unless an associated variable has been removed from the Factors list in the main
dialog box.
 Compare main effects. This option allows you to request pairwise comparisons of
levels of selected main effects. The Confidence Interval Adjustment allows you to
apply an adjustment to the confidence intervals and significance values to account for
multiple comparisons. The available methods are LSD (no adjustment), Bonferroni,
and Sidak. Finally, for each factor, you can select a reference category to which