VGAM (version 1.1-9)

backPain: Data on Back Pain Prognosis, from Anderson (1984)

Description

Data from a study of patients suffering from back pain. Prognostic variables were recorded at presentation and progress was categorised three weeks after treatment.

Usage

data(backPain)

Arguments

Format

A data frame with 101 observations on the following 4 variables.

x2

length of previous attack.

x3

pain change.

x4

lordosis.

pain

an ordered factor describing the progress of each patient with levels worse < same < slight.improvement < moderate.improvement < marked.improvement < complete.relief.

References

Anderson, J. A. (1984). Regression and Ordered Categorical Variables. J. R. Statist. Soc. B, 46(1), 1-30.

Yee, T. W. (2010). The VGAM package for categorical data analysis. Journal of Statistical Software, 32, 1--34. tools:::Rd_expr_doi("10.18637/jss.v032.i10").

Examples

Run this code
summary(backPain)
summary(backPain2)

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