I have the following data.frame:
index <- c("a","a","b","b","b")
alpha <- c(1,2,3,4,5)
beta <- c(2,3,4,5,6)
table <-data.frame(index,alpha,beta)
I'm now interested in getting means of alpha and beta for each of the
index values and do a tapply() for each of the columns, e.g.
means.alpha <- tapply(table$alpha, index,mean)
means.beta <- tapply(table$beta,index,mean)
but as one tapply function, something like
tapply(table[2:3], index, mean), but this clearly doesnt' work.
Suggestions?
Thanks,
Andrew
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