IBM Water System SPSS COMPLEX SAMPLES 19 Manual de usuario Pagina 79

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Complex Samples Ordinal Regression
Figure 11-1
Ordinal Regression dialog box
E Select a dependent variable.
Optionally, you can:
Select variables for factors and covariates, as appropriate for your data.
Specify a variable to dene a subpopulation. The analysis is performed only for the selected
category of the subpopulation variable, although variances are still properly estimated based
on the entire dataset.
Select a link function.
Link function. The link function is a transformation of the cumulative probabilities that allows
estimation of the model. Five link functions are available, summarized in t he following table.
Function
Form
Typical application
Logit log( ξ /(1ξ) ) Evenly distributed catego ries
Complementary log-log log(log(1ξ)) Higher c ategories more probable
Negative log-log log(log(ξ)) Lower cate gories more probable
Probit Φ
1
(ξ) Latent va r iable is normally
distributed
Cauchit (inverse Cauchy) tan(π(ξ0.5)) Latent variable has many extrem e
values
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