LocalLm.X0: Local linear fit at X0 with Epanechnikov kernel
In npmlda: Nonparametric Models for Longitudinal Data

Local linear fit at X0 with Epanechnikov kernel

1	LocalLm.X0(Xvec, Yvec, X0, Bndwdth, Wt = 1)

`Xvec, Yvec`	numeric vectors of data values, Xvec and Yvec must have the same length.
`X0`	a given value
`Bndwdth`	a bandwidth of the kernel
`Wt`	a weight vector or a constant. For longitudinal data, Wt=1/N corresponds to measurement uniform weight and Wt=1/(nni) corresponds subject uniform weight.