[R] "bucketing" observations

[Dan Dube]

great!  the "cut" function was exactly what i needed.

thank you both! 

> -----Original Message-----
> From: Dimitris Rizopoulos [mailto:d.rizopoulos at erasmusmc.nl] 
> Sent: Monday, April 06, 2009 4:01 PM
> To: Dan Dube
> Cc: r-help at r-project.org
> Subject: Re: [R] "bucketing" observations
> 
> 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
> 
> Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
> Tel: +31/(0)10/7043478
> Fax: +31/(0)10/7043014
>