Nothing
cdrop <-
function(x, cutoff=0, attrib=FALSE)
{
if (inherits(x, "mefa")) {
cs <- colSums(xtab(x))
} else if (inherits(x, "Mefa")) {
cs <- colSums(Matrix::as.matrix(mefa4::xtab(x)))
} else cs <- colSums(x)
if (any(cs <= cutoff)) {
exclude <- which(cs <= cutoff)
rval <- x[,-exclude]
if (attrib) {
attr(rval, "exclude") <- exclude
attr(attr(rval, "exclude"), "cutoff") <- cutoff
attr(attr(rval, "exclude"), "margin") <- 2
}
rval
} else x
}
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