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...o delete one of them which has smaller V3 value. i.e., in the data below, I want to delete the first observation. How can I do that ? Thanks in advance! V1 V2 V3 3 3 1 3 3 4 -- View this message in context: http://www.nabble.com/How-to-delete-a-duplicate-observation-tf4437033.html#a12659033 Sent from the R help mailing list archive at Nabble.com.