Re: [R] group by quantiles

2008-11-18 Thread Gabor Grothendieck
The gtools package has quantcut. On Tue, Nov 18, 2008 at 6:53 AM, Daniel Brewer <[EMAIL PROTECTED]> wrote: > Hello, > > I was just wondering whether there is a quick way to divide a vector of > data into four groups defined by the quantiles? > i.e. > 0-25% > 25-50% > 50-75% > 75-100% > > Many than

Re: [R] group by quantiles

2008-11-18 Thread Frank E Harrell Jr
Daniel Brewer wrote: Hello, I was just wondering whether there is a quick way to divide a vector of data into four groups defined by the quantiles? i.e. 0-25% 25-50% 50-75% 75-100% Many thanks Dan library(Hmisc) cut2(x, g=4) -- Frank E Harrell Jr Professor and Chair School of M

Re: [R] group by quantiles

2008-11-18 Thread Dimitris Rizopoulos
check at cut() and split(), e.g., x <- rnorm(100) qx <- quantile(x) ind <- cut(x, qx, include.lowest = TRUE) split(x, ind) I hope it helps. Best, Dimitris Daniel Brewer wrote: Hello, I was just wondering whether there is a quick way to divide a vector of data into four groups defined by the

[R] group by quantiles

2008-11-18 Thread Daniel Brewer
Hello, I was just wondering whether there is a quick way to divide a vector of data into four groups defined by the quantiles? i.e. 0-25% 25-50% 50-75% 75-100% Many thanks Dan -- ** Daniel Brewer, Ph.D. Institute of Cancer Research M