[R] aggregating using several functions

From: Christoph Scherber <Christoph.Scherber_at_uni-jena.de>
Date: Tue 25 Oct 2005 - 00:55:39 EST


Dear R users,

I would like to aggregate a data frame using several functions at once (e.g., mean plus standard error).

How can I make this work using aggregate()? The help file says scalar functions are needed; can anyone help?

Below is the code for my "meanse" function which IŽd like to use like this:

aggregate(dataframe, list(factorA,factoB),meanse)

Thanks for your help!
Christoph

meanse<-function(x,...,na.rm=T){
if(na.rm)

x<-x[!is.na(x)]
m<-mean(x)
s<-sd(x)
l<-length(x)

serr<-s/sqrt(l)
return(data.frame(list("Mean"=m,"Std.Error"=serr))) }

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