A vector of values to which local modeling techniques are applied.
xi
An n-vector of data values.
h
The bandwidth controlling the size of the window used for the
local estimation around x.
g
A shape parameter required for the symmetric beta kernel. The default
is g = 0 which yields the uniform kernel. Some common values are g = 1 for the
Epanechnikov kernel, g = 2 for the biweight kernel, and