Kernel functions for creating kernel based weights with
An object of class
list of length 5.
Supported kernels are below.
Formulas come from Anselin & Morrison's notes.
uniform: K(z) = 1/2 for |z|<1
triangular: K(z) = (1-|z|) for |z| < 1
epanechnikov: K(z) = (3/4)(1-z^2) for |z| < 1
quartic: K(z) = (15/16)*(1-(z/threshold)^2^)2 for |z| < 1
guassian: K(z) = (2pi)^1/2 * exp(-z^2/2)
a list of length 5 where each element is a kernel function.
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