backPain {VGAM} | R Documentation |
Data from a study of patients suffering from back pain. Prognostic variables were recorded at presentation and progress was categorised three weeks after treatment.
data(backPain)
A data frame with 101 observations on the following 4 variables.
length of previous attack.
pain change.
lordosis.
an ordered factor describing the progress of each
patient with levels worse
< same
<
slight.improvement
< moderate.improvement
<
marked.improvement
< complete.relief
.
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).
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/.
summary(backPain)