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crosstabulation
2002 May 23
2
crosstabulation of means
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)
list(mean(z,na.rm=T),sd(z,na.rm=T),length(z))
aa <- by(x,list(g1,g2),funy)
bb <- matrix(unlist(aa),nrow=3
,dimnames=list(c(&...