Don | R Documentation |
The function Don
measures the dynamic interaction between two moving objects following
the methods outlined by Doncaster (1990).
Don(traj, traj2, tc = 0, dc = 0, plot = TRUE)
traj |
an object of the class |
traj2 |
(optional) same as traj, but for the second group of individuals. See |
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.
A data.frame is returned that contains the values for 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.This function can optionally return 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 (for each pair). The expected values based on all fixes are also included.
Doncaster, C.P. (1992) Non-parametric estimates of interaction from radio-tracking data. Journal of Theoretical Biology, 143: 431-443.
GetSimultaneous
data(deer)
#tc = 7.5 minutes, dc = 50 meters
Don(deer, tc = 7.5*60, dc = 50)
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