Introductory And Intermediate Growth Models - Mplus

Growth Models With Categorical Outcomes• Measurement invariance of the outcome over time isrepresented by the equality of thresholds over time (rather thanintercepts)• Thresholds not set to zero but held equal across timepoints—intercept factor mean value fixed at zero• Differences in variances of the outcome over time arerepresented by allowing scale parameters to vary over time191The NIMH Schizophrenia Collaborative Study• The Data—The NIMH Schizophrenia Collaborative Study(Schizophrenia Data)• A group of 64 patients using a placebo and 249 patients ona drug for schizophrenia measured at baseline and at weeksone through six• Variables—severity of illness, background variables, andtreatment variable• Data for the analysis—severity of illness at weeks one, two,four, and six and treatment19296