I think you could get this done with the function "tapply", but it's not
clear because you don't give an example of your data. If tapply is not
the answer, certainly there is a way that is better than resorting to
doing it 'by hand' (brute force).
See ?tapply
Best,
Erik Iverson
tieflingrogue wrote:
>
>
> I have a data set which has, let's say, income by state. I'm trying to
> output income quartiles for each state into an array by doing a loop so that
> I don't have to do it state by state by hand.
>
> ie, something like
>
> for (i in 1:50) {
>
> quantile(subset(data,state==i)$income) -> r[i,5] }
>
>
> where the output of quantile will give 5 columns for each state. r would
> be a 50x5 matrix where each row represents state i's income quartiles.
>
> thanks
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