A.1 SAS EXAMPLES

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SAS EXAMPLESSAS is general-purpose software for a wide variety of statistical analyses. The mainprocedures (PROCs) for categorical data analyses are FREQ, GENMOD, LOGISTIC,NLMIXED, GLIMMIX, and CATMOD. PROC FREQ performs basic analyses fortwo-way and three-way contingency tables. PROC GENMOD fits generalized linearmodels using ML or Bayesian methods, cumulative link models for ordinal responses,zero-inflated Poisson regression models for count data, and GEE analyses for marginalmodels. PROC LOGISTIC gives ML fitting of binary response models, cumulative linkmodels for ordinal responses, and baseline-category logit models for nominal responses.(PROC SURVEYLOGISTIC fits binary and multi-category regression models to sur-vey data by incorporating the sample design into the analysis and using the method ofpseudo ML.)

(\poi" for Poisson, \bin" for binomial, \mult" for multinomial, \negbin" for negative binomial) and speci es the link function in the LINK option. For binomial models with grouped data, the response in the model statements takes the form of the number of \successes" divided by the number of cases. Table 6 illustrates for the snoring data

  Model, Binomial