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...ance, I was using this command: aggregate(list(myData$length, myData$type), list(myData$Name), FUN = mean) But it can't deal with string data. I hope I have been clear enough. With regards, Phil -- View this message in context: http://r.789695.n4.nabble.com/Data-manipulation-with-aggregate-tp4635298.html Sent from the R help mailing list archive at Nabble.com.