IBM Water System SPSS COMPLEX SAMPLES 19 Manual de usuario Pagina 216

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Chapter 21
Those who drive less frequently show greater support for the bill than those who drive more
frequently.
The coefcients for the variables gender and votelast, in addition to not being statistically
signicant, appear to be small compared to other coefcients.
The design effects indicate that some of the standard errors computed for these parameter
estimates are larger than those you would obtain if you used a simple random sample, while
others are smaller. It is vitally important to incorporate the sampling design information in your
analysis because you might otherwise infer, for example, that the coefcient for the third level
of Age category, [agecat=3],issignicantly different from 0!
Classification
Figure 21-9
Categorical variable information
Given the observed data, the “null” model (that is, one without predictors) would classify all
customers into the modal group, Agree. Thus, the null model would be correct 27.3% of the time.
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