GLM Estimated Marginal Means

Select the factors and interactions for which you want estimates of the population marginal means in the cells. These means are adjusted for the covariates, if any.

Compare main effects

Provides uncorrected pairwise comparisons among estimated marginal means for any main effect in the model, for both between- and within-subjects factors. This item is available only if main effects are selected under the Display Means For list.

Compare simple main effects

The setting is enabled whenever the target list contains one or more product or interaction effects (for example, A*B, A*B*C). The setting supports the specification of comparisons among simple main effects, which are main effects nested within the levels of other factors.

Confidence interval adjustment

Select least significant difference (LSD), Bonferroni, or Sidak adjustment to the confidence intervals and significance. This item is available only when Compare main effects and/or Compare simple main effects is selected.

Specifying Estimated Marginal Means

1. From the menus choose one of the procedures available under > Analyze > General Linear Model.
2. In the main dialog, click EM Means.