On Sun, 3 Aug 2008, Thomas P C Chu wrote:
Thanks to Mr Dalgaard for his advice and everyone else who has contributed.
Inclusion of an error term at the end of sim.set$y = ... line did cure my
problems with drop1() and step().
I suppose it is my own inexperience in carrying out simulations caused such
gaffe.
R 2.8.0 will warn if asked to compute F tests that are essentially 0/0
(where 'essentially' is relative to the total sum of squares). It does so
in your examples, so in future it will be easier to notice this.
--
Brian D. Ripley, [EMAIL PROTECTED]
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
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