ulcer: The ulcer data

In pblm: Bivariate Additive Marginal Regression for Categorical Responses

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; and regularly.

pain

patients' post operative pain level. A factor with levels none, slight and moderate

.

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 and operation

Source

Dale, J. R. (1986) Global Cross-Ratio Models for Bivariate, Discrete, Ordered Responses. Biometrics, 42(4), 909-917.

Examples

data(ulcer)

pblm documentation built on June 19, 2025, 5:08 p.m.