Then you need to look elsewhere, like the reference in ?formula and the books in the R FAQ.
I am his co-author, but I still think Bill Venables' account in MASS (Venables & Ripley, 1994, 7, 9, 2002) is unequalled. On Fri, 2 Apr 2004, Leonard Assis wrote: > Where Can I Have More information about Formulae in R (Nesti8ng, > Crossing Factors, Etc). I´ve tried to obtain this information in R Help > and that source were a kind of inconclusive for my Doubts. -- 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html