[R] function which can apply a function by a grouping variable and also hand over an additional variable, e.g. a weight

[Hadley Wickham]

You might want to check out the plyr package.
Hadley

On Fri, Oct 1, 2010 at 6:05 AM, Werner W. <pensterfuzzer at yahoo.de> wrote:
> Hi,
>
> I was wondering if there is an easy way to accomplish the following in R:
> Often I want to apply a function, e.g. weighted.quantile from the Hmisc package
> to grouped subsets of a data.frame (grouping variable) but then I also need to
> hand over the weights which seems not possible with summaryBy or aggregate or
> the like.
>
> Is there a function to do this? Currently I do this with loops but it is very
> slow.
>
> I would be very grateful for any hints.
>
> Thanks,
>  Werner
>
>
>
>
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-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/