On Mar 5, 2010, at 11:43 AM, Tarmo Remmel 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:
No, those are not "factors" in the R sense... but they _should_ be:
> a <- factor(c(1,2,3,4,5), levels=1:6)
> b <- factor(c(1,2,5,5,6), levels=1:6)
>
> tab <- table(a,b)
> tab
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
6 0 0 0 0 0 0
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
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
