How to generate natural cubic spline in R?

Hi David,

David Winsemius schrieb:

The splinefun documentation indicates that "natural" is one of the types 
of cubic spline options available.

That sounds good, didn't know that... rcs() has the advantage of coming 
with a book (Harrell's "Regression Modeling Strategies").

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.

Nope, but you can include rcs() within fitting functions, 
lm(foo~rcs(bar,3)), which makes more sense to me than having a spline 
function fit... Looks like better encapsulation to me.

Best,
Stephan