From ripley at stats.ox.ac.uk  Tue Apr  1 11:22:39 2003
From: ripley at stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Tue Apr  1 10:22:58 2003
Subject: [Rd] predict (PR#2686)
Message-ID: <200304010822.h318Mdn9024768@pubhealth.ku.dk>

On Tue, 1 Apr 2003 Mark.Bravington@csiro.au wrote:

> Prediction from the original data was just an example, of course; my general
> proposal is that inactive factor levels in the prediction set should be
> dropped. I don't see how this could ever cause inconsistent behaviour across
> prediction sets-- have I missed something?

Yes, repeatedly: `inactive' depends on the prediction set, and that's not 
thought desirable.

-- 
Brian D. Ripley,                  ripley@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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


[Rd] predict (PR#2686)
ripley@stats.ox.ac.uk