Rheumatoid Arthritis Clinical Trial

Description

Rheumatoid self-assessment scores for 302 patients, measured on a five-level ordinal response scale at three follow-up times.

Usage

data(arthritis)

Format

A data frame with 906 observations on the following 7 variables:

id

Patient identifier variable.

y

Self-assessment score of rheumatoid arthritis measured on a five-level ordinal response scale.

sex

Coded as (1) for female and (2) for male.

age

Recorded at the baseline.

trt

Treatment group variable, coded as (1) for the placebo group and (2) for the drug group.

baseline

Self-assessment score of rheumatoid arthritis at the baseline.

time

Follow-up time recorded in months.

Source

Lipsitz, S.R. and Kim, K. and Zhao, L. (1994). Analysis of repeated categorical data using generalized estimating equations. Statistics in Medicine, 13, 1149–1163.

Examples

data(arthritis)
str(arthritis)