CoalMiners {vcd} | R Documentation

## Breathlessness and Wheeze in Coal Miners

### Description

Data from Ashford & Snowden (1970) given by Agresti (1990) on the association between two pulmonary conditions, breathlessness and wheeze, in a large sample of coal miners.

### Usage

    data(CoalMiners)

### Format

A 3-dimensional array resulting from cross-tabulating variables for 16,330 coal miners. The variables and their levels are as follows:

No | Name | Levels
1 | Wheeze | W, NoW
2 | Breathlessness | B, NoB
3 | Age | 25-29, 30-34, ..., 60-64

### Source

Michael Friendly (2000), Visualizing Categorical Data, pages 82–83, 319–322.

### References

A. Agresti (1990), Categorical Data Analysis. Wiley-Interscience, New York.

J. R. Ashford & R. D. Snowdon (1970), Multivariate probit analysis, Biometrics, 26, 535–546.

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

### Examples

    data(CoalMiners)

    ## Fourfold display, both margins equated
    fourfold(CoalMiners, mfcol = c(2,4))

    ## Log Odds Ratio Plot
    summary(l <- oddsratio(CoalMiners))
    g <- seq(25, 60, by = 5)
    plot(l,
         xlab = "Age Group",
         main = "Breathlessness and Wheeze in Coal Miners")
    m <- lm(l ~ g + I(g^2))
    lines(fitted(m), col = "red")

    ## Fourfold display, strata equated
    fourfold(CoalMiners, std = "ind.max", mfcol = c(2,4))

[Package vcd version 0.9-6 Index]