[R] "bucketing" observations

[Bert Gunter]

?cut
?quantile (perhaps, to define the breaks) 


Bert Gunter
Genentech Nonclinical Biostatistics
650-467-7374

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Dan Dube
Sent: Monday, April 06, 2009 12:45 PM
To: r-help at r-project.org
Subject: [R] "bucketing" observations

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!

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.