Description Usage Arguments Value Author(s)

Given the coordinates of two bivariate samples, this function calculates (computationally) the area of overlap between two standard ellipses. Note, be sure to use a sufficiently low step size when creating the ellipses (i.e. to ensure that there is no excessive discretising of the elliptical shape). As a result of this process, you will inevitably underestimate the true ellipse areas and hence their overlap (although this bias is likely to be inconsequential) if a suitable fine scale is chosen for the step size. There is no single rule for making this choice as it depends on the angle and shape of the ellipse but a step-size of 1 should be more than sufficient in most cases (N.B. the default steps=5). The ellipses calculated are the small sample size corrected standard ellipses.

1 | ```
overlap(x1,y1,x2,y2,steps = 5)
``` |

`x1` |
A vector containing the x coordinates of the first data. |

`y1` |
A vector containing the y coordinates of the first data. |

`x2` |
A vector containing the x coordinates of the second data. |

`y2` |
A vector containing the y coordinates of the second data. |

`steps` |
The number of steps in degrees to estimate points on the curve. |

`overlap` |
The area of overlap between the two standard ellipses. |

`area1` |
The area of the first ellipse. |

`area2` |
The area of the second ellipse. |

Andrew Jackson

siar documentation built on May 30, 2017, 2:17 a.m.

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