Nothing
# Kernel functions
kernel.function.epan=function(u)
{
3/4*(1-u^2)*(abs(u)<=1)
}
kernel.function.gauss=function(u)
{
dnorm(u)
}
kernel.function.quart=function(u)
{
15/16*(1-u^2)*(abs(u)<=1)
}
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