R: Psychiatric Clinical Trial

psychiatric {DPpackage} | R Documentation

## Psychiatric Clinical Trial

### Description

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.

### Usage

    data(psychiatric)

### Format

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

### Source

Hedeker, D. and Gibbons, R.D. (1994) A random-effects ordinal regression model for multilevel data. Biometrics, 50: 933-944.

### References

Hedeker, D. and Gibbons, R.D. (1994) A random-effects ordinal regression model for multilevel data. Biometrics, 50: 933-944.

### Examples

    data(psychiatric)
    ## maybe str(psychiatric) ; plot(psychiatric) ...

[Package DPpackage version 1.1-7.4 Index]