ulcer {pblm} | R Documentation |
The ulcer data
Description
Data analyzed by Dale (1986)
Usage
data(ulcer)
Format
A data frame with 48 observations and 4 variables.
medication
medication requirements. A factor with levels
never
;seldom
;occasionally
; andregularly
.pain
patients' post operative pain level. A factor with levels
none
,slight
andmoderate
.
operation
a factor representing the type of operation with levels: vagatomy drainage procedure (
vp
); vagatomy and distal antrectomy (va
); vagatomy and hemigastrectomy (vh
); and resection alone (ra
)
.
freq
a numeric vector representing the number of patients classified for the corresponding levels of
pain
,medication
andoperation
Source
Dale, J. R. (1986) Global Cross-Ratio Models for Bivariate, Discrete,
Ordered Responses. Biometrics, 42(4), 909-917.
Examples
data(ulcer)
[Package pblm version 0.1-12 Index]