GLM Model

Specify Model. A full factorial model contains all factor main effects, all covariate main effects, and all factor-by-factor interactions. It does not contain covariate interactions. Select Build terms to specify only a subset of interactions or to specify factor-by-covariate interactions. You must indicate all of the terms to be included in the model. Select Build custom terms to include nested terms or when you want to explicitly build any term variable by variable.

Factors and Covariates. The factors and covariates are listed.

Model. The model depends on the nature of your data. After selecting Build terms, you can select the main effects and interactions that are of interest in your analysis.

Sum of squares. The method of calculating the sums of squares. For balanced or unbalanced models with no missing cells, the Type III sum-of-squares method is most commonly used.

Include intercept in model. The intercept is usually included in the model. If you can assume that the data pass through the origin, you can exclude the intercept.

Specifying Models for GLM

1. From the menus choose:

   Analyze > General Linear Model

2. Choose Univariate or Multivariate.
3. In the dialog box, click Model.
4. In the Model dialog box, select Build terms.
5. Select one or more factors or covariates or a combination of factors and covariates.
6. Select a method for building the terms and click the move button.
7. Repeat until you have all of the terms that you want in the model. Do not use the same term more than once in the model.
8. Select a type of sums of squares and whether or not you want the intercept.

GLM Multivariate is available only if you have SPSS® Statistics Standard Edition or the Advanced Statistics Option installed.