Nothing
strata.opticut <-
function (object, ...) {
if (!is.na(object$comb) && is.factor(object$strata))
return(object$strata)
if (!is.na(object$comb) && !is.factor(object$strata))
return(as.factor(rownames(object$strata)))
as.factor(apply(object$strata, 1, paste, collapse=""))
}
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