R: Arthritis Treatment Data

Arthritis {vcd} | R Documentation

## Arthritis Treatment Data

### Description

Data from Koch \& Edwards (1988) from a double-blind clinical trial investigating a new treatment for rheumatoid arthritis.

### Usage

    data("Arthritis")

### Format

A data frame with 84 observations and 5 variables.

ID

  patient ID.

Treatment

  factor indicating treatment (Placebo, Treated).

Sex

  factor indicating sex (Female, Male).

Age

  age of patient.

Improved

  ordered factor indicating treatment outcome (None, Some, Marked).

### Source

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

### References

G. Koch \& S. Edwards (1988), Clinical efficiency trials with categorical data. In K. E. Peace (ed.), Biopharmaceutical Statistics for Drug Development, 403–451. Marcel Dekker, New York.

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

### Examples

    data("Arthritis")
    art <- xtabs(~ Treatment + Improved, data = Arthritis, subset = Sex == "Female")
    art

    mosaic(art, gp = shading_Friendly)
    mosaic(art, gp = shading_max)

[Package vcd version 1.4-4 Index]