Are you looking for sample datasets? Or something more? Sample datasets that work include:
?ethanol The relationship between E (x-variable) and NOx (y-variable) is very nonlinear, and a polynomial does not fit as well as a spline. ?mtcars Predict mpg (gas mileage) using weight, hp, or displacement. The relationship follows a hyperbola (so fitting 1/mpg is fairly linear), but you can start by fitting a straight line, showing how it misses the main trend, then fit a spline to show the better fit. Car.test.frame in the rpart package has simmilar data. You might also take a look at the TkSpline, TkApprox, and loess.demo functions in the TeachingDemos package as well as the ccc and related datasets in that package. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Erin Hodgess > Sent: Monday, August 25, 2008 10:52 AM > To: r-help@r-project.org > Subject: [R] small spline regression example > > Dear R People: > > Could someone recommend a small example for spline regression, please? > > I would like to show this to my students, step by step. > > Thanks in advance, > Erin > > > -- > Erin Hodgess > Associate Professor > Department of Computer and Mathematical Sciences University > of Houston - Downtown > mailto: [EMAIL PROTECTED] > > ______________________________________________ > 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.
