[R] crosstabulation of means

R. Heberto Ghezzo heberto.ghezzo at mcgill.ca
Thu May 23 19:56:52 CEST 2002

Hello, I am trying to print a crosttabulation of mean,sd,n for a
continuous variable crossclassified by anoother/s grouping variables. I
came up with:
xtab2 <- function(x,g1,g2) {
 funy <- function(z)
 aa <- by(x,list(g1,g2),funy)
 bb <- matrix(unlist(aa),nrow=3
                    length(levels(as.factor(g2)))) ) ))
but as you can see the labels of the columns correspond only to the
second factor, and if I try to generalize it to 3 grouping variables the
thing does not work.
Any suggestions please on how to write the dimnames paragraph

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