problem with model.matrix
On Fri, 25 Jun 2004, Berwin A Turlach wrote:
"BN" == Balasubramanian Narasimhan <naras at stanford.edu> writes:
BN> Trevor's problem is reproducible on R 1.8.1 (which is what he
BN> was using) on both Linux RHEL 3.0 and Solaris and R 1.8.0 on
BN> Windows.
Yep, on my Linux box (details below) I have the same problem with R
1.8.1 but no problem under R 1.9.0 or R 1.9.1.
Time to upgrade I would say. :)
Here is the reason (NEWS for 1.9.0)
o contrasts() turns a logical variable into a factor. This now
always has levels c("FALSE", "TRUE") even if only one (or
none) of these occur in the variable.
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 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595