[R] loess question

Prof Brian D Ripley ripley at stats.ox.ac.uk
Sat Apr 14 20:42:09 CEST 2001

On Sat, 14 Apr 2001, Edwin Guo wrote:

> Hi,
> I used loess( ) to build a model that has 5 predictors using R of Wndows
> version. And it tells me that there is an unknown error. If I decrease
> the number of predictors, then there will be no error. My questions are:
> 1. Can loess( ) handle more than 4 predictors.
> 2. If it can not, is there any other smoothing regression technique that
> can handle more predictors.
> Any comment will be very helpful to me. Thank you in advance!

Well, possibly you are short of points: you need *many* points in 4D
to do non-parametric smoothing (say billions).

You will need send us an example and the exact output to help you, though!

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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