SAS/STAT 9.2 User's Guide: The MIXED Procedure (Book Excerpt)

3894 ✦ Chapter 56: The MIXED Procedure
The output from this analysis is as follows.
Figure 56.8 Model Information
The Mixed Procedure
Model Information
Data Set WORK.HEIGHTS
Dependent Variable Height
Covariance Structure Variance Components
Estimation Method REML
Residual Variance Method Profile
Fixed Effects SE Method Model-Based
Degrees of Freedom Method Containment
The “Model Information” table in Figure 56.8 shows that the containment method is used to compute
the degrees of freedom for this analysis. This is the default method when a RANDOM statement
is used; see the description of the DDFM= option for more information.
Figure 56.9 Class Level Information
Class Level Information
Class Levels Values
Family 4 1 2 3 4
Gender 2 F M
The “Class Level Information” table in Figure 56.9 is the same as before. The “Dimensions” table
in Figure 56.10 displays the new sizes of the X and Z matrices.
Figure 56.10 Dimensions and Number of Observations
Dimensions
Covariance Parameters 3
Columns in X 3
Columns in Z 12
Subjects 1
Max Obs Per Subject 18
Number of Observations
Number of Observations Read 18
Number of Observations Used 18
Number of Observations Not Used 0
The “Iteration History” table in Figure 56.11 displays the results of the numerical optimization
of the restricted/residual likelihood. Six iterations are required to achieve the default convergence