Nothing
calculate.xtab<-function(v1,v2,varnames=NULL) {
counts<-table(v1,v2)
row.margin<-apply(counts,1,sum)
col.margin<-apply(counts,2,sum)
vl1<-attr(v1,"value.labels")
if(!is.null(vl1) && length(vl1)) {
vl1<-sort(vl1)
if(length(rownames(counts)) < length(vl1))
vl1<-vl1[vl1 %in% rownames(counts)]
if(is.null(names(vl1))) names(row.margin)<-vl1
else names(row.margin)<-names(vl1)
}
vl2<-attr(v2,"value.labels")
if(!is.null(vl2) && length(vl2)) {
vl2<-sort(vl2)
if(length(colnames(counts)) < length(vl2))
vl2 <- vl2[vl2 %in% colnames(counts)]
if(is.null(names(vl2))) names(col.margin)<-vl2
else names(col.margin)<-names(vl2)
}
if(is.null(varnames)) {
rowname<-deparse(substitute(v1))
colname<-deparse(substitute(v2))
}
else {
rowname<-varnames[1]
colname<-varnames[2]
}
xt<-list(counts=counts,row.margin=row.margin,col.margin=col.margin,
varnames=c(rowname,colname))
attr(xt, "class") <- "xtab"
return(xt)
}
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