User Guide

74
Chapter 7
Logit Loglinear Analysis Model
Figure 7-2
Logit Loglinear Analysis Model dialog box
Specify Model. A saturated model contains all main effects and interactions involving
factor variables. It does not contain covariate terms. Select
Custom to specify only a
subset of interactions or to specify factor-by-covariate interactions.
Factors and Covariates. The factors and covariates are listed, with (Cov) indicating
a covariate.
Terms in Model. The model depends on the nature of your data. After selecting Custom,
you can select the main effects and interactions that are of interest in your analysis. You
must indicate all of the terms to be included in the model.
Terms are added to the design by taking all possible combinations of the dependent
terms and matching each combination with each term in the model list. If
Include
constant for dependent
is selected, there is also a unit term (1) added to the model list.
For example, suppose variables D1 and D2 are the dependent variables. A
dependent terms list is created by the Logit Loglinear Analysis procedure (D1, D2,
D1*D2). If the Terms in Model list contains M1 and M2 and a constant is included, the
model list contains 1, M1, and M2. The resultant design includes combinations of each
model term with each dependent term: