R: B.20 Movements of blue periwinkles.

fisherB20 {circular} | R Documentation

## B.20 Movements of blue periwinkles.

### Description

Distances 'x' and directions 'theta' by small blue periwinkles, Nodilittorina unifasciata, after they had been transplanted downshore from the height at which they normaly live.

### Usage

    data(fisherB20)
    data(fisherB20c)

### Format

`fisherB20` is a `data.frame` of integer value. `fisherB20c` 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. 252-253. Data kindly supplied by Dr A. Underwood and Ms G. Chapman.

### References

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

### Examples

    data(fisherB20)
    data(fisherB20c)
    par(mfcol=c(1,3))
    plot(fisherB20c$theta, xlab=expression(theta))
    boxplot(fisherB20c$x, xlab="x")
    plot(c(fisherB20$x, fisherB20$x), c(fisherB20$theta,
      fisherB20$theta+360), xlab="x", ylab=expression(theta))

[Package circular version 0.4-93 Index]