schiz {sabreR}R Documentation

Ordered Response Model

Description

In this example we analyse ordinal data on changes in the severity of Schizophrenia in data from the National Institute of Mental Health (NIMH), see Rabe-Hesketh and Skrondal (2005, Ch 5). Patients were randomly allocated to 1 of 4 treatments (Placebo, Chlorpromazine, Fluphenazine, Thioridazine) and examined weekly for up to 6 weeks. The data have previously been analysed by Hedeker and Gibbons (1996a), Gibbons et al. (1998) and Gibbons and Hedeker (1994). In this example we follow Rabe-Hesketh and Skrondal (2005, Ch 5) and combine the treatments Chlorpromazine, Fluphenazine and Thioridazine.

Usage

schiz

Format

A data frame containing 1603 rows and 8 columns.

Source

National Institute of Mental Health (NIMH)

References

Gibbons, R. D., Hedeker, C., Waterneaux, C., & Davis, J.M., (1988), Random regression models: A comprehensive approach to the analysis of longitudinal psychiatric data, Psychopharmacology Bulletin, 24, 438-443

Gibbons, R. D., & Hedeker, C., (1994), Application of random effects probit regression models, Journal of Consulting and Clinical Psyschology.

Hedeker, D., & Gibbons, R.D., (1996), Applied longitudinal data anlaysis, Chichester, UK, Wiley

Rabe-Hesketh, S., and Skrondal, A., (2005), Multilevel and Longitudinal Modelling using Stata, Stata Press, Stata Corp, College Station, Texas.


[Package sabreR version 1.0 Index]