machinists {VGAM} | R Documentation

## Machinists Accidents

### Description

A small count data set involving 414 machinists from a three months study, of accidents around the end of WWI.

### Usage

    data(machinists)

### Format

A data frame with the following variables.

accidents

  The number of accidents

ofreq

  Observed frequency, i.e., the number of machinists with that many accidents

### Details

The data was collected over a period of three months. There were 414 machinists in total. Also, there were data collected over six months, but it is not given here.

### Source

Incidence of Industrial Accidents. Report No. 4 (Industrial Fatigue Research Board), Stationery Office, London, 1919.

### References

Greenwood, M. and Yule, G. U. (1920). An Inquiry into the Nature of Frequency Distributions Representative of Multiple Happenings with Particular Reference to the Occurrence of Multiple Attacks of Disease or of Repeated Accidents. Journal of the Royal Statistical Society, 83, 255–279.

### See Also

`negbinomial`, `poissonff`.

### Examples

    machinists
    mean(with(machinists, rep(accidents, times = ofreq)))
     var(with(machinists, rep(accidents, times = ofreq)))
    ## Not run:  barplot(with(machinists, ofreq),
              names.arg = as.character(with(machinists, accidents)),
              main = "Machinists accidents",
              col = "lightblue", las = 1,
              ylab = "Frequency", xlab = "accidents")
    ## End(Not run)

[Package VGAM version 1.1-1 Index]