I think this last line is a fortune candidate: It's not just that different disciplines rediscover the same ideas, they also relabel them.
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Terry Therneau > Sent: Wednesday, May 12, 2010 6:49 AM > To: sam.e > Cc: r-help@r-project.org > Subject: Re: [R] Splines under tension > > ---begin included message --- > > Does anyone know if R has a function for splines under tension. I know > there are numerous packages for spline interpolation within R i just > can't find one that lets you determine the tension factor. > > ------------------ > > In the statistics literature these are called "smoothing splines". For > instance the s(x) construct in gam or pspline(x) in a coxph formula. > There are multiple ways to specify the 'tension factor', many in the > statistics community prefer the 'equivalent degrees of freedom' so you > will often see df=___ in the examples. You can also directly enter a > penalty mulitplier. > To get a clearer answer you would need to give the explicit > definition of "tension factor" from the literature you are quoting. > It's not just that different disciplines rediscover the same ideas, > they > also relabel them. > > Terry Therneau > > ______________________________________________ > 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. ______________________________________________ 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.