Instrumental to the
sBF function. It returns weights used in the Nadaraya-Watson estimator.
K(u, method = "gaussian")
distance from the origin.
type of kernel function. The default value is
The domain of the kernel functions is centered at the origin and generally the weight value returned by the kernel decreases while the distance
u from the origin increases.
Silverman, B. W. (1986) Density Estimation. London: Chapman and Hall.
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