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2007 Nov 13
2
Getting mean in a dataframe
Sorry to hijack this thread. I have a similar but slightly different situation. Using the original poster's example, how to elegantly get the mean of column V2 when column V1 is either A or C and F1 is 0? Thanks, Gang On Nov 13, 2007, at 5:30 AM, Petr PIKAL wrote: > Hi > > r-help-bounces@r-project.org napsal dne 13.11.2007 10:59:09: > >> Dear list, >> >> I