Loglinear Analysis Model

Specify Model. A saturated model contains all factor main effects and all factor-by-factor interactions. Select Custom to specify a generating class for an unsaturated model.

Generating Class. A generating class is a list of the highest-order terms in which factors appear. A hierarchical model contains the terms that define the generating class and all lower-order relatives. Suppose you select variables A, B, and C in the Factors list and then select Interaction from the Build Terms drop-down list. The resulting model will contain the specified 3-way interaction A*B*C, the 2-way interactions A*B, A*C, and B*C, and main effects for A, B, and C. Do not specify the lower-order relatives in the generating class.

For the selected factors:

Interaction

Creates the highest-level interaction term of all selected variables. This is the default.

Main effects

Creates a main-effects term for each variable selected.

All 2-way

Creates all possible two-way interactions of the selected variables.

All 3-way

Creates all possible three-way interactions of the selected variables.

All 4-way

Creates all possible four-way interactions of the selected variables.

All 5-way

Creates all possible five-way interactions of the selected variables.

Specifying Models for Model Selection Loglinear Analysis

1. From the menus choose:

   Analyze > Loglinear > Model Selection...

2. Select one or more factors.
3. Click Model.
4. In the Model dialog box, select Custom.
5. Select a method for building terms.
6. Repeat these steps until you have all of the highest-order terms you want in the generating class.

Do not specify lower-order relatives of terms already included in the generating class.