[R] identify subsets based on two grouping factors

Phil Spector spector at stat.berkeley.edu
Mon Jan 31 22:58:42 CET 2011

Rajarshi -
    It's not clear to me what you mean by "the distribution of 
levels obs.".  Does


give you something like what you want?

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu

On Mon, 31 Jan 2011, Rajarshi Guha wrote:

> Hi, I have a data.frame that has a categorical variable, for which I
> would like to look at the distribution of levels of this variable,
> based on a grouping of two other variables.
> As an example:
> x <- data.frame(obs=sample(c('low', 'high'),100, replace=TRUE),
> grp1=sample(1:10, 100, replace=TRUE),
> grp2=runif(100))
> cut.grp1 <- cut(x$grp1, 3)
> cut.grp2 <- cut(x$grp2, 3)
> Thus, for each combination of levels in cut.grp1 and cut.grp2, I'd
> like to obtain the distribution of levels obs. I know I can loop over
> each pair of levels in cut.grp1 and cut.grp2, but is there a more
> elegant way to achieve this?
> -- 
> Rajarshi Guha
> NIH Chemical Genomics Center
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