Hi sjaffem,

You were almost there:

tapply( yourdata, groups, weighted.mean, weights)

See ?tapply for more information.

HTH,
Jorge


On Tue, Feb 2, 2010 at 3:58 PM, sjaffe <> wrote:

>
> I'm sure I can put this together from the various 'apply's and split, but I
> wonder if anyone has a quick incantation:
>
> E.g. I can do tapply( data, groups, mean)
>
> but how can I do something like:  tapply( list(data,weights), groups,
> weighted.mean ) ?
>
> (or: mapply is to sapply as ? is to tapply )
>
> Thanks for your help.
> --
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