coalminers {VGAM} | R Documentation

## Breathlessness and Wheeze Amongst Coalminers Data

### Description

Coalminers who are smokers without radiological pneumoconiosis, classified by age, breathlessness and wheeze.

### Usage

    data(coalminers)

### Format

A data frame with 9 age groups with the following 5 columns.

BW

  Counts with breathlessness and wheeze.

BnW

  Counts with breathlessness but no wheeze.

nBW

  Counts with no breathlessness but wheeze.

nBnW

  Counts with neither breathlessness or wheeze.

age

  Age of the coal miners (actually, the midpoints of the 5-year category ranges).

### Details

The data were published in Ashford and Sowden (1970). A more recent analysis is McCullagh and Nelder (1989, Section 6.6).

### Source

Ashford, J. R. and Sowden, R. R. (1970) Multi-variate probit analysis. Biometrics, 26, 535–546.

### References

McCullagh, P. and Nelder, J. A. (1989) Generalized Linear Models. 2nd ed. London: Chapman & Hall.

### Examples

    str(coalminers)

[Package VGAM version 1.0-3 Index]