David, Please read the first two paragraphs of Details from ?formula
You can try out the formulas with the notation > expand.formula <- function(f) colnames(attr(terms(f), "factors")) > expand.formula(~a+b) [1] "a" "b" > expand.formula(~a:b) [1] "a:b" > expand.formula(~a*b) [1] "a" "b" "a:b" > expand.formula(~a/b) [1] "a" "a:b" > See a design text for more information. Rich On Tue, May 10, 2011 at 4:51 PM, Rovinpiper <david.j.mee...@gmail.com>wrote: > So what is the difference between a colon and an asterisk in this code? For > that matter what does the slash mean? > > -- > View this message in context: > http://r.789695.n4.nabble.com/ANOVA-1-too-few-degrees-of-freedom-tp3493349p3512977.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ 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.
