On Jul 28, 2010, at 7:55 AM, Tim Gruene wrote:
Hello,
I have 2D-data on a torus, i.e. they are scattered within [0:2pi)
and are
supposed to be periodic with period 2pi.
Is there a way in R for a kernel density estimation for such data? I
found this
article http://www.dmqte.unich.it/personal/dimarzio/density46.pdf
but
a) I don't fully understand the article (my knowledge in statistics
is poor)
b) I did not understand which Eq. represents the kernel(s)
c) I do not now R well enough to understand whether I can use kde2d
or nprudens
with an arbitrary kernel
My simple-minded attempt was to extend the data to [-2pi:4pi) and
then use
kde2d, but I am wondering
a) how accurate is this
b) is there a way to do it properly on a torus.
You could take a look at the density function within the package,
"circular".
--
David Winsemius, MD
West Hartford, CT
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