>>>>> "SK" == Stephan Kolassa <stephan.kola...@gmx.de>
>>>>> on Tue, 31 Mar 2009 22:20:50 +0200 writes:
SK> Hi David,
SK> David Winsemius schrieb:
>> The splinefun documentation indicates that "natural" is one of the types
>> of cubic spline options available.
SK> That sounds good, didn't know that... rcs() has the advantage of coming
SK> with a book (Harrell's "Regression Modeling Strategies").
well, and splinefun() comes with R !!!
>> 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.
SK> Nope, but you can include rcs() within fitting functions,
SK> lm(foo~rcs(bar,3)), which makes more sense to me than having a spline
SK> function fit... Looks like better encapsulation to me.
well, but ns() has been part of the S language for ages, and
part of R since its very early days,
exactly for the purpose to be used in something like
lm(y ~ ns(.) + ..)
So while rcs() may have extra merits, (I assume it does, as I
assume Frank Harrell will have known about ns()),
in order to solve the OP's problem, I still believe that
"standard R" [and "good old S version 3 for that matter]
contains all functionality needed.
Martin Maechler, ETH Zurich
SK> Best,
SK> Stephan
SK> ______________________________________________
SK> R-help@r-project.org mailing list
SK> https://stat.ethz.ch/mailman/listinfo/r-help
SK> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
SK> and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
