To run a Linear Mixed Models analysis,
from the menus choose:
Analyze > Mixed Models > Linear...
Figure 1. Specify Subjects
and Repeated dialog box
In the Specify Subjects and Repeated dialog,
select Market ID as a subject variable.
Click Continue.
Figure 2. Linear Mixed Models main dialog box
Select Units Sold as the dependent variable.
Select Promotion as a factor.
Click Fixed.
Figure 3. Fixed Effects
dialog box
In the Fixed Effects dialog, select promo in the Factors and Covariates listbox
and click Add.
Click Continue.
Click Random in the Linear Mixed Models dialog box.
Figure 4. Random Effects dialog box
Select Scaled Identity as the Covariance type.
Select Include Intercept in the Random Effects group.
Select Market ID as a subject identification
variable in the Subjects Groupings group.
Click Continue.
Click Statistics
in the Linear Mixed Models dialog box.
Figure 5. Statistics dialog
box
In the Statistics dialog, select Parameter estimates, Tests for covariance parameters, and
Covariances of random effects in the Model Statistics group.
