[R] averaging rows on a data.frame according to a factor
ruipbarradas at sapo.pt
Sat Nov 23 00:02:11 CET 2013
Try the following.
aggregate(cbind(V2, V3) ~ V1, dat, FUN = mean)
Hope this helps,
Em 22-11-2013 21:43, john d escreveu:
> Dear all,
> I apologize for the newbie question, but I'm stuck.
> I have a data frame in the following form:
> dat<-as.data.frame(cbind(c("a","a","a","b","b"), c(1,2,3,3,2),c(4,3,5,4,4)))
> I need a way to generate a new dataframe with the average for each factor.
> The result should look like:
> res<-as.data.frame(cbind(c("a","b"), c(2,2.5),c(4,4)))
> Any help would be greatly appreciated.
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