Hi list members,

 

I'm trying to use the dpik function (pkg = KernSmooth) to calculate
bandwidths (following Wand & Jones 1995) for use in estimating kernel
home ranges from location data.  I was hoping to use function kernelUD
(pkg =adehabitatHR) to estimate the home ranges, passing the dpik
bandwidth as a numeric value.  I can use dpik to calculate bandwidths
for both x and y coordinates (within home ranges), but kernelUD needs a
single estimate of the bandwidth.  I understand that if the variances of
x and y coordinates differ (which they do in my case) I should not
simply use the average of x and y bandwidths calculated from raw
location data.  Rather, the x and y coordinates should be scaled (e.g.
by dividing by the standard deviation) before estimating the bandwidth.
That's also no problem, but then I'm left with either (1) 2 bandwidths
estimated from scaled data, which I still can't pass to kernelUD, or (2)
the mean of the 2 scaled bandwidths, which I don't know how to
"back-scale" into original units.

 

Any advice would be greatly appreciated.

 

Cheers,

Eric

 


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