MSPatients: Diagnosis of Multiple Sclerosis

In vcd: Visualizing Categorical Data

Diagnosis of Multiple Sclerosis

Description

Data from Westlund & Kurland (1953) on the diagnosis of multiple sclerosis (MS): two samples of patients, one from Winnipeg and one from New Orleans, were each rated by two neurologists (one from each city) in four diagnostic categories.

Usage

data("MSPatients")

Format

A 3-dimensional array resulting from cross-tabulating 218 observations on 3 variables. The variables and their levels are as follows:

No	Name	Levels
1	New Orleans Neurologist	Certain, Probable, Possible, Doubtful
2	Winnipeg Neurologist	Certain, Probable, Possible, Doubtful
3	Patients	Winnipeg, New Orleans

Source

M. Friendly (2000), Visualizing Categorical Data: http://euclid.psych.yorku.ca/ftp/sas/vcd/catdata/msdiag.sas

References

K. B. Westlund & L. T. Kurland (1953), Studies on multiple sclerosis in Winnipeg, Manitoba and New Orleans, Louisiana, American Journal of Hygiene, 57, 380–396.

M. Friendly (2000), Visualizing Categorical Data. SAS Institute, Cary, NC.

Examples

data("MSPatients")
## Not run: 
## best visualized using a resized device, e.g. using:
## get(getOption("device"))(width = 12)
pushViewport(viewport(layout = grid.layout(ncol = 2)))
pushViewport(viewport(layout.pos.col = 1))
popViewport()
pushViewport(viewport(layout.pos.col = 2))
popViewport(2)
dev.off()

## End(Not run)

## alternative, more convenient way
mplot(
  agreementplot(t(MSPatients[,,1]), return_grob = TRUE,
    main = "Winnipeg Patients"),
  agreementplot(t(MSPatients[,,2]), return_grob = TRUE,
    main = "New Orleans Patients")
)

## alternatively, use cotabplot:
cotabplot(MSPatients, panel = cotab_agreementplot)

vcd documentation built on Sept. 17, 2024, 1:08 a.m.