Description Usage Arguments Details Value References See Also Examples

The function `Don`

measures the dynamic interaction between two moving objects following
the methods outlined by Doncaster (1990).

1 |

`traj1` |
an object of the class |

`traj2` |
same as |

`tc` |
time threshold for determining simultaneous fixes – see function: |

`dc` |
distance tolerance limit (in appropriate units) for defining when two fixes are spatially together. |

`plot` |
logical, whether or not to plot the Doncaster plot. Default = TRUE. |

This function can be used to compute the Doncaster (1990) methods for measuring
dynamic interaction between two objects. The Doncaster method tests the proportion
of simultaneous fixes that are below `dc`

against that which would be
expected based on the distribution of distances between all fixes.

This function first returns a plot, for distance values ranging from 0 to the maximum
distance separating two fixes, of the observed proportion of simultaneous fixes below
each distance value. The expected values based on all fixes are also included.
Second, a list is returned that contains the contingency table of simultaneous fixes
(paired) and non-paired fixes below and above `dc`

, along with the
associated *p*-value from the Chi-squared test.

conTable – contingency table showing frequency of paired and non-paired fixes above and below

`dc`

.p.value –

*p*-value from the Chi-squared test of`conTable`

.

Doncaster, C.P. (1992) Non-parametric estimates of interaction from radio-tracking
data. *Journal of Theoretical Biology*, **143**: 431-443.

GetSimultaneous

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