A survey of models for repeated ordered categorical response data.
We survey models for analysing repeated observations on an ordered categorical response variable. The models presented are univariate models that permit correlation among repeated measurements. The models describe simultaneously the dependence of marginal response distributions on values of explanatory variables and on the occasion of response. We present models for three transformations of the response distribution: cumulative logits, adjacent-category logits, and the mean for scores assigned to response categories. We discuss three methods for fitting the models: maximum likelihood, weighted least squares, and semi-parametric. Weighted least squares is easily implemented with SAS, as illustrated with a study designed to compare a drug with a placebo for the treatment of insomnia.
Agresti
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Department of Statistics, University of Florida, Gainesville 32611.
D002965:Classification / Q000379:methods*; D005500:Follow-Up Studies; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D016018:Least-Squares Analysis; D016013:Likelihood Functions; D016014:Linear Models; D016015:Logistic Models; D008137:Longitudinal Studies; D015999:Multivariate Analysis; D012044:Regression Analysis; D007319:Sleep Initiation and Maintenance Disorders / Q000517:prevention & control; D012984:Software; D013997:Time Factors
D006993:Hypnotics and Sedatives