Yan Li wrote:
Hi, all
I am trying to get the basis matrix and penalty matrix for natural
cubic splines. In the "splines" package of R,"ns" can
generate the B-spline basis matrix for a natural cubic spline. How can
I get the basis matrix and penalty matrix for natural cubic
spline.
Thanks a lot!
Lee
In usual practice the natural cubic spline does not use penalization.
Frank
--
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
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