[R] Calculating Summaries for each level of a Categorical variable

David W Freedman dxf1 at cdc.gov
Sun Jun 27 15:35:33 CEST 2010

I'd suggest using the functions within the Hmisc and plyr packages:

library(Hmisc); library(plyr)
df=data.frame(v1=rnorm(10), v2=rnorm(10),
wt=sample(1:5,rep=T),sex=rep(0:1,each=5)); df

hope this helps, david freedman

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