[R] "bucketing" observations

[Dimitris Rizopoulos]

try this:

dat <- data.frame(vals = rnorm(1000))
breaks <- quantile(dat$vals, seq(0, 1, .1))
dat$bucket <- cut(dat$vals, breaks, labels = FALSE, include.lowest = TRUE)


I hope it helps.

Best,
Dimitris


Dan Dube wrote:
> is there a better way to bucket observations into more-or-less evenly
> sized buckets than this?  it seems like this must be a common operation:
> 
> dt = data.frame(points=rnorm(1000),bucket=NA)
> 
> breaks = quantile(dt$points,seq(0:1,.1))
> for (i in 2:length(breaks)) {
> 	if (i == 2) {
> 		ind = which(dt$points >= breaks[i-1] & dt$points <=
> breaks[i])
> 	} else {
> 		ind = which(dt$points > breaks[i-1] & dt$points <=
> breaks[i])
> 	}
> 	dt$bucket[ind] = i-1
> }
> 
> thanks!
> 
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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