schizo {mixcat}

National Institute of Mental Health shizophrenia study

Description

Schizophrenia data from a randomized controlled trial with patients assigned to either drug or placebo group. "Severity of Illness" was measured, at weeks 0,1,...6, on a four category ordered scale: 1. normal or borderline mentally ill, 2. mildly or moderately ill, 3. markedly ill, and 4. severely or among the most extremely ill. Most of the observations where made on weeks 0,1,3, and 6.

Usage

data(schizo)

Format

A data frame with 1603 observations on 437 subjects. Four numerical vectors contain information on

id

patient ID.

y

ordinal response on a 4 category scale.

trt

treatment indicator: 1 for drug, 0 for placebo.

wk

week.

Source

http://tigger.uic.edu/~hedeker/ml.html

References

Hedeker, D. and Gibbons, R. (2006). Longitudinal Data Analysis. Wiley, Palo Alto, CA.