vcd (version 1.4-12)

MSPatients: 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

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")
if (FALSE) {
## 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()
}

## 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)