Description

The imps data frame has 1544 rows and 8 columns. The data is from National Institute of the Mental Health Schizophrenia Collaborative Study, where the effect of chlorpromazine, fluphenazine, or thioridazine treatment on the overall severity of the schizophrenia disorder is of interest.

Usage

Format

This data frame contains the following columns:

ID

patient ID

IMPS79

the severity of the schizophrenia disorder (ranges from 0 to 7)

Week

the fixed visit time

Drug

the indicator of treatment (1: chlorphromazine, fluphenazine, or thioridazine treatment; 0: placebo)

Sex

the indicator of sex of the patients (1: male; 0: female)

R

an indicator of the missingness (1: observed; 0: missing)

Time

square root of the Week covariate

Y

an indicator if IMPS >=4

Source

Gibbons, R.D. and Hedeker, D., 1994. Application of random-effects probit regression models. Journal of consulting and clinical psychology, 62(2), p.285.

References

Shen, C. W., & Chen, Y. H. (2012). Model selection for generalized estimating equations accommodating dropout missingness. Biometrics, 68(4), 1046-1054.