R: B.18 Wind direction and ozone concentration.

fisherB18 {circular} | R Documentation

## B.18 Wind direction and ozone concentration.

### Description

19 measuremenents of wind direction 'theta' and ozone level 'x' taken at 6.00am at four-day intervals between April 18th and June 29th, 1975 at a weather station in Milwaukee.

### Usage

    data(fisherB18)
    data(fisherB18c)

### Format

`fisherB18` is a `data.frame` of integer value. `fisherB18c` is a `data.frame` that contains the same observations, but in the first column, the data is a `circular` object.

### Source

N.I. Fisher (1993) pag. 251. Johnson & Wehrly (1977, Table 1).

### References

N.I. Fisher (1993) Statistical analysis of circular data. Cambridge University Press.

### Examples

    data(fisherB18)
    data(fisherB18c)
    par(mfcol=c(1,3))
    plot(fisherB18c$theta, xlab=expression(theta))
    boxplot(fisherB18c$x, xlab="x")
    plot(c(fisherB18$x, fisherB18$x), c(fisherB18$theta,
      fisherB18$theta+360), xlab="x", ylab=expression(theta))

[Package circular version 0.4-93 Index]