[R] Closed form for regression splines

From: Stephen A Roberts <Steve.Roberts_at_manchester.ac.uk>
Date: Tue 06 Dec 2005 - 00:36:29 EST

Greetings,

I have a model fitted using bs() and need to be able to write down a closed form for the spline function to enable the use of the fitted model outside R. Does anyone know a simple way of extracting the piecewise cubics from the coefficients and knots? As far as I know they are defined by recurrence relationships, but the R implementation is buried in C code, and I guess in non-trivial to invert. I know about predict.bs() within R, but I want the full piecewise cubic.

Steve.

  Dr Steve Roberts
  steve.roberts@manchester.ac.uk

Senior Lecturer in Medical Statistics,
Biostatistics Group,
University of Manchester,



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