As I understand it, you are trying to subset the data frame to include only rows with a non-unique id.
Try this: x <- data.frame(cbind(id=c(1,2,2,2,3,3,4,5,6,6), value=1:10)) id.table <- table(x$id) x_new <- subset(x, id %in% id.table[id.table > 1]) Jeremy
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