On Wed, 19 Mar 2008, Liaw, Andy wrote: > [I believe few users manipulate formulae and model frames like this, so > I'm posting here instead of R-help.] > > I just found out that model.frame() includes all terms, including those > preceded by "-" in the formula, in its output (as mentioned on its help > page). Is there a recommended way of excluding "negative" terms? My > guess is that I can use info in the terms attribute to figure this out, > but that doesn't seem very straightforward. Any pointer would be much > appreciated.
?terms.formula, argument 'simplify', if I understand you aright. > > Best, > Andy > > Andy Liaw, PhD > Biometrics Research PO Box 2000 RY33-300 > Merck Research Labs Rahway, NJ 07065 > andy_liaw(a)merck.com 732-594-0820 -- 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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
