On Sat, Jun 5, 2010 at 2:01 PM, RICHARD M. HEIBERGER <r...@temple.edu> wrote: > The "/" is used for nesting and is defined by > A/B == A + (B %in% A) > > thus > (a+b)/c == (a+b) + c %in% (a+b) == a + b + a:b:c
...I guess I could then ask why %in% is defined that way, but actually this rephrasing somehow helped me figure it out :-). In case anyone else with the same confusion finds this thread: the point in either case is that a variable can't be nested in two other variables separately, so the user must have meant it was nested in both together. -- Nathaniel ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
