David Winsemius wrote:
The splinefun documentation indicates that "natural" is one of the types
of cubic spline options available.
Does rcs actually do fitting? Such would not be my expectation on
reading the documentation and I do not see any examples of such
functionality in the help pages.
It expands a predictor into the truncated power basis functions for the
natural cubic spline. This is an easier basis to use than the B-spline
basis. rcs calls the Hmisc function rcspline.eval which you may want to
look at first.
Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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