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...end and so on, but it still did not work. I certainly do something wrong, but I haven?t found it in the help manual yet. Could someone tell me where is my mistake, please? Thank you a lot! -- View this message in context: http://r.789695.n4.nabble.com/Defining-x-by-names-of-columns-in-my-dataset-tp3746689p3746689.html Sent from the R help mailing list archive at Nabble.com.