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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