IBM SPSS COMPLEX SAMPLES 19 manual Model Summary, Tests of Model Effects

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Complex Samples General Linear Model

ESelect a Simple contrast and 3 Self and family as the reference category for shopfor. Note that, once selected, the category appears as “3” in the dialog box.

ESelect a Simple contrast and 1 No as the reference category for usecoup.

EClick Continue.

EClick OK in the General Linear Model dialog box.

Model Summary

Figure 19-6

R-square statistic

R-square, the coefficient of determination, is a measure of the strength of the model fit. It shows that about 60% of the variation in Amount spent is explained by the model, which gives you good explanatory ability. You may still want to add other predictors to the model to further improve the fit.

Tests of Model Effects

Figure 19-7

Tests of between-subjects effects

Each term in the model, plus the model as a whole, is tested for whether the value of its effect equals 0. Terms with significance values of less than 0.05 have some discernible effect. Thus, all model terms contribute to the model.