backPain {VGAM}R Documentation

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)

Format

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

x1

length of previous attack.

x2

pain change.

x3

lordosis.

pain

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

Source

http://ideas.repec.org/c/boc/bocode/s419001.html

The data set and this help file was copied from gnm so that a vignette in VGAM could be run; the analysis is described in Yee (2010).

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. http://www.jstatsoft.org/v32/i10/.

Examples

summary(backPain)

[Package VGAM version 1.1-1 Index]