On Jan 1, 2017, at 12:26 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:
I couldn't find anything, but you might try searching on "thin plate
splines" on rseek.org. I realize these are different than principal
surfaces, but they might nevertheless be useful to you. Or not.
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Sun, Jan 1, 2017 at 2:56 AM, Neverstop . <neverstop at hotmail.it> wrote:
Hello,
I need to summarize a three-dimensional dataset through a principal surface that passes through the middle of the data. Principal surfaces are non-linear generalization of the plane created by the first two principal components and provide a non-linear summary of p-dimensional dataset. Principal surfaces are described in this 1989 article by Hastie and Stuetzle: https://web.stanford.edu/~hastie/Papers/Principal_Curves.pdf . They were introduced by Trevor Hastie in his Ph.D dissertation: http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-r-276.pdf
I'm looking for a package to fit principal surfaces with R.
I've come across the package princurve created by TrevorHastie, but it allows to fit principal curves only. How can I fit two-dimensional principal surfaces in R?