[R] Aggregate with multiple statistics?

[hadley wickham]

> Try summaryBy in package doBy. e.g. using the built in dataset CO2:
>
> summaryBy(uptake ~ Plant, CO2, FUN = c(mean, min, max))

Or with reshape with a little more work:

cm <- melt(CO2, id=1:4)
cast(cm, Type ~ Treatment, c(min,mean,max))

but you get some extra flexibility:

cast(cm, result_variable + Type ~ Treatment, c(min,mean,max))
cast(cm, Type ~ Treatment ~ result_variable, c(min,mean,max))
cast(cm, Type + Treatment ~ result_variable, c(min,mean,max))

Regards,

Hadley