calcA | R Documentation |
Calculates the decomposition of the kernel smoothing matrix in two part: a diagonal matrix D and a symmetric matrix A. This function is not intended to be used directly.
calcA(X,bx,kernelx="g")
X |
The matrix of explanatory variables, size n, p. |
bx |
The vector of bandwidth of length p. |
kernelx |
Character string which allows to choose between gaussian kernel
( |
see the reference for detailed explanation of A and D and the meaning of coefficients.
Returns a list containing two matrices: the symmetric matrix A
in component A
) and the square root of the diagonal matrix
D in the component Ddemi
and the trace of the smoother
in the component df
.
Pierre-Andre Cornillon, Nicolas Hengartner and Eric Matzner-Lober.
ibr
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