Transcription of A.1 SAS EXAMPLES
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A.1 SAS EXAMPLES
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.)
logistic regression model with a binary indicator as a predictor. PROC LOGISTIC uses FREQ to weight counts, serving the same purpose for which PROC FREQ uses WEIGHT. The BARNARD option in the EXACT statement provides an unconditional exact test for the di erence of proportions for 2 2 tables.
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