Q Matrix Variables in Q3 Model

Use this field to specify those variables containing the columns of the Q matrix ; that is, the matrix containing population assignments, in the third Q model. Alternatively, a matrix containing principal components analysis (PCA) assignments can be used (Zhao et al. 2007). These variables are used as fixed effects in the model .

To Specify One or More Q Matrix Variables in the Q3 Model:

Specify the Input SAS Data Set .

All of the variables in the specified input data set are displayed in the Available Variables field.

Examine the list of available variables.

Highlight the desired variables. Left-click a single variable, or hold down Ctrl while left-clicking to select multiple variables.

Click to add the highlighted variable(s) to the Q Matrix Variables in Q3 Model field, as shown below: