>
> In this simple case you can just coerce directly to a vector like so:
>
> > foo <- by(dat, dat$GROUP, function(x) {weighted.mean(x$VALUE,
> x$FREQUENCY)})
> > bar <- as.vector(foo)
>
> but look at the examples for ?by; in particular the use of 'sapply'.
>
> Norm
As a general practice, I believe unlist() is preferable. ?unlist explains
why.
Cheers,
Bert Gunter
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