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...fferent levels in 2009$var2 to use the average of the whole column 2008$var2. Anybody has some ideas? Please help me... Hope it`s clear enough what I need. Thanks! alberto -- View this message in context: http://r.789695.n4.nabble.com/conditional-mean-between-two-data-frames-with-different-levels-tp3049010p3049010.html Sent from the R help mailing list archive at Nabble.com.