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2011 Nov 29
2
aggregate syntax for grouped column means
...6", "205m7", "205m7", "205m7", "600m1", "600m1", "600m1", "600m3", "600m3", "600m3", "600m4", "600m4", "600m4", "600m5", "600m5", "600m5", "600m7", "600m7", "600m7")), .Names = c("var1", "var2", "id"), row.names = c(NA, -45L), class = "data.frame") > head(myData) var1 var2 id 1 31.59 33.78 0m4 2 32.21 33.25 0m4 3 31.78 NA 0m4 4 31.34 32.05 0m5 5 31.61 32.59 0m5 6 31...