document: Fitting mixed-effects models for repeated ordinal outcomes with the NLMIXED procedure This paper presents an analysis of repeated ordinal outcomes arising from two psychological studies . The first case is a repeated measures analysis of variance ; the second is a mixed-effects regression . in a longitudinal design . In both , the subject-specific variation is modeled by including random effects in the linear predictor -LRB- inside a link function -RRB- of a generalized linear model . The NLMIXED procedure in SAS is used to fit the mixed-effects models for the categorical response data . The presentation emphasizes the parallel between the model . specifications and the SAS statements . The purpose of this paper is to facilitate the use of mixed-effects models in the analysis of repeated ordinal outcomes
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