Re: Summary: bug-let in predict.glm()

[Don McKenzie <dmck@silvae.cfr.washington.edu>]

On Wed, 6 Dec 2000, Buttrey, Samuel wrote:

> Many thanks to those who responded to my question about a bug in
> predict.glm.
>[snip] 
> Finally, Gerard ("All Others Bring Data") Jean noted an additional problem
> with predict.glm(); it chokes when a data frame has had a new level added to
> some factor variable, even if no observation takes on that level. Again
> predict.gam() can handle this.

Doesn't this make sense though?  On what basis could one predict a
response at an unmodelled level of a factor?

Thanks for enlightenment..

_______________________________________________________________________

                           DON MCKENZIE

                        Research Ecologist
              College of Forest Resources, Box 352100
                      University of Washington 
                        Seattle, WA 98195

                            206.543.2789
                       dmck@u.washington.edu

_______________________________________________________________________
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