try your first "reproducible line" first :-)



On Thu, Jul 23, 2009 at 5:18 PM, Alexis Maluendas <avmaluendasp@gmail.com>wrote:

> Hi R experts,
>
> I need know how calculate a weighted mean by group in a data frame. I have
> tried with aggragate() function:
>
> data.frame(x=c(15,12,3,10,10),g=c(1,1,1,2,2,3,3),w=c(2,3,1,5,5,2,5)) -> d
> aggregate(d$x,by=list(d$g),weighted.mean,w=d$w)
>
> Generating the following error:
>
> Error en FUN(X[[1L]], ...) : 'x' and 'w' must have the same length
>
> Thanks in advance
>
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>
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>

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