1.
If you create the design using Custom Design, select Save X Matrix from the red triangle menu in the Custom Design window. In the design table that Custom Design creates, click the red triangle next to the Model Matrix script and select Edit. The model matrix is given as X.
2.
For an arbitrary design table, select Analyze > Fit Model. Enter effects to describe your model. Click Run. From the report’s red triangle menu, select Save Columns > Save Coding Table. The model matrix is defined by the columns corresponding to the intercept and model effects.