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...at works fine. Is this the best way of obtaining a data frame with the 3 columns? I know in this example I could have used tapply, but the actual data consists of several variables. Thanks. David -- View this message in context: http://r.789695.n4.nabble.com/aggregate-with-non-scalar-functions-tp2313759p2313759.html Sent from the R help mailing list archive at Nabble.com.