Description

Data from patients with acute rheumathoid arthritis. A new agent was compared with an active control, and each patient was evaluated on a five-point assessment scale.

Usage

Format

A data frame with 10 observations on the following 3 variables.

Drug

a factor with levels Active.control New.agent

Improvement

an ordered factor with levels Much.worse < Worse < No.change < Improved < Much.improved

n

number of patients in group

Details

The global assessment in this example may be subdivided in the coarse response "improvement", "no change" and "worse". On a higher level improvement is split into "much improved" and "improved", while the "worse" category is split into "worse" and "much worse".

Source

Ludwig Fahrmeir, Gerhard Tutz (1994): Multivariate Statistical Modelling Based on Generalized Linear Models. Springer Series in Statistics. Springer Verlag. New-York Berlin Heidelberg

Examples