Description Usage Format Source References Examples
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.
1 |
A data frame with 1603 observations on the following 5 variables.
id
a numeric vector giving a unique identifier for the subject in the study
imps79o
a factor giving the Impatient Multidimensional Psuchiatric Scale
scored as 1
= normal or borderline mentally ill,
2
= midly or moderately ill, 3
= markadely ill,
and 4
= severely or among the the most extremely ill
tx
a numeric vector giving the treatment group, 0=Placebo, 1=Drug
week
a numeric vector giving the week where the measurement ocurred
sweek
a numeric vector giving the square root transformation of time
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.
1 2 | data(psychiatric)
## maybe str(psychiatric) ; plot(psychiatric) ...
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