Those are numerical, not factors. If they were factors all levels would be represented.
> a <- factor(c(1,2,3,4,5), levels = 1:5) > b <- factor(c(1,2,5,5,6), levels = 1:6) > table(a, b) b a 1 2 3 4 5 6 1 1 0 0 0 0 0 2 0 1 0 0 0 0 3 0 0 0 0 1 0 4 0 0 0 0 1 0 5 0 0 0 0 0 1 On Fri, Mar 5, 2010 at 11:43 AM, Tarmo Remmel <remm...@yorku.ca> wrote: > Hello, > > This is a seemingly simple task, but it has been frustrating me for too > long, so I am turning to this list for some help. > > I have two vectors of factors which are quite long; two simple examples are > shown here: > >> a <- c(1,2,3,4,5) >> b <- c(1,2,5,5,6) > > If I produce a cross-tabulation of these vectors, I get the following: > >> tab <- table(a,b) > >> table(a,b) > b > a 1 2 5 6 > 1 1 0 0 0 > 2 0 1 0 0 > 3 0 0 1 0 > 4 0 0 1 0 > 5 0 0 0 1 > > I really want to have this cross-tabulation expanded to include all factors > present in the input data. Thus, I need additional columns for categories 3 > and 4, and a row for category 6, albeit, they will be filled with zeros. Is > there an easy way of doing this? > > Thanks, > > Tarmo > > > > ____________________________________________ > Tarmo K. Remmel Ph.D. > Assistant Professor, Department of Geography > York University, N413A Ross Building > Toronto, Ontario, M3J 1P3, Canada > Tel: 416-736-2100 x22496; Fax: 416-736-5988 > http://www.yorku.ca/remmelt > Skype: tarmoremmel > > ______________________________________________ > 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. > ______________________________________________ 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.
