psychiatric {DPpackage} | R Documentation |
This data set consider information from a pychiatric clinical trial, reported by Hedeker and Gibbons (1994) and collected in the NIMH Schizophrenia Collaborative Study on treatment-related changes in overall severity. For each patient, the Impatient Multidimensional Psychiatric Scale was scored. In this study, 437 patients were randomly assigned to receive one of four medications: placebo, chlorpromazine, fluphenazine, or thioridazine.
data(psychiatric)
A data frame with 1603 observations on the following 5 variables.
id
imps79o
1
= normal or borderline mentally ill,
2
= midly or moderately ill, 3
= markadely ill,
and 4
= severely or among the the most extremely illtx
week
sweek
Hedeker, D. and Gibbons, R.D. (1994) A random-effects ordinal regression model for multilevel data. Biometrics, 50: 933-944.
Hedeker, D. and Gibbons, R.D. (1994) A random-effects ordinal regression model for multilevel data. Biometrics, 50: 933-944.
data(psychiatric) ## maybe str(psychiatric) ; plot(psychiatric) ...