[R] Comparing Type 2 regressions
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Feb 9 17:12:18 CET 2000
> Date: Wed, 09 Feb 2000 10:11:20 -0500
> From: "Pete St. Onge" <pete at seul.org>
> Subject: Comparing Type 2 regressions Was: [R] Ancova in R?
> For starters, thanks to everyone who responsded to my previous request for
> help about Type 2 regression.
> > > I see the R-sm has the ancova thing happening, but I kind of doubt that
> > > what I'm trying to do is "smoothing"...
> > And what is R-sm? An obscure reference to the sm package on CRAN,
> > perhaps? There is a function sm.ancova in that package, and that
> > compares a set of nonparametric regression curves.
> To follow this up with the other thread, is there a way to compare two or
> more lines based on Type 2 regression techniques (or lines based on the 1st
> principal component) to see if they are significantly different from each
> other with respect to their slopes and intercepts?
Well, that has nothing to do with sm.ancova, and it is quoting me without
> This is not a subject that I've seen dealt with in any of the stats books
> that I've read, and pointers to other references that do would be
Once again. W.A. Fuller (1977), Measurement Error Models, has the
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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