identify subsets based on two grouping factors
Rajarshi -
It's not clear to me what you mean by "the distribution of
levels obs.". Does
as.data.frame(table(x$obs,cut.grp1,cut.grp2))
give you something like what you want?
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spector at stat.berkeley.edu
On Mon, 31 Jan 2011, Rajarshi Guha wrote:
Hi, I have a data.frame that has a categorical variable, for which I
would like to look at the distribution of levels of this variable,
based on a grouping of two other variables.
As an example:
x <- data.frame(obs=sample(c('low', 'high'),100, replace=TRUE),
grp1=sample(1:10, 100, replace=TRUE),
grp2=runif(100))
cut.grp1 <- cut(x$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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