Function to estimate 2 dimensional reference bandwidth for kernel density estimation
rhrHref(xy, rescale = "none")
data.frame with two columns: x and y coordinates
character, indicating if and if how data
Function to calcualte reference bandwidth. This
implementation is based on Worton (1989). If variances
differ greatly, it is advaisable to rescale the data
rescale="unitvar". If the data is suspected
to multimodal other bandwidth estimation methods may be
more suitable. Seaman and Powell (1996) modified the
method slighty by calculating the reference bandwidth for
each dimension independently. The same result is obtained
rescale=TRUE. If rescaling is performed with
unit variance both methods will lead to the same result.
vector of length two
Seaman, D. E., & Powell, R. A. (1996). An evaluation of the accuracy of kernel density estimators for home range analysis. _Ecology, 77(7)_, 2075-2085.
Worton, B. J. (1989). Kernel methods for estimating the utilization distribution in home-range studies. _Ecology, 70(1)_, 164-168.