[R] supsmu vs. ppr

Prof Brian D Ripley ripley at stats.ox.ac.uk
Tue Feb 13 08:13:28 CET 2001

On Mon, 12 Feb 2001 david.beede at mail.doc.gov wrote:

> Thanks, Thomas.  I am still new to R, and I didn't know about the -fitted-
> function.
> One thing to note, however -- if you just do plot(a.ppr) in your example,
> the predicted values will be standardized.

plot(a.ppr) does *not* plot predicted values, it plots a single term, the
ridge function used.  And that is clearly stated on the help page
for plot.ppr.  Different multiples of the ridge function are used for the
regression of the various components of y, so there is no way this could be
a `prediction'.

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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