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...17 low 8 1 1 2 1 12 low I am also very grateful if someone could point out a good internet tutorial resource for R functions such as if-else and loops and how to use them in conjunction with tables. It should contain simple examples if possible. As ever indepted to you, Matthias -- View this message in context: http://r.789695.n4.nabble.com/how-to-calculate-the-mean-of-a-group-in-a-table-tp3505986p3505986.html Sent from the R help mailing list archive at Nabble.com.