Just a quickly beginner's question. I wanna find the mean only from the values from a column related to specific values from another one. Like, theres a 'region' column, i want the mean of the value on 'profit' column only from "south" sells from 'region' column -- View this message in context: http://www.nabble.com/Simple-one-tp24329691p24329691.html Sent from the R help mailing list archive at Nabble.com.
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