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...nal data set. To be precise, I have both dichotomous and polytomous items. Also, I would like to specify different covariance structures (unstructured, ar1 etc) for trial runs. Thanks -- View this message in context: http://www.nabble.com/ordinal-logistic-regression-for-longitudinal-data-set-tp23225097p23225097.html Sent from the R help mailing list archive at Nabble.com.