[R] how to do by-processing using weighted.mean

[Frank E Harrell Jr]

Denis Chabot wrote:
> Hi,
> 
> I'd like to compute the weighted mean of some variables, all using the 
> same weight variable, for each combination of 3 factor variables.
> 
> I found how I could use "summarize" (from Hmisc) to do normal means for 
> combinations of 3 factors, but I cannot find a way of doing weighted 
> means. Is it possible in R?
> 
> Thanks in advance,
> 
> Denis Chabot
> 
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It's in one of the summarize examples!

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University