On Sat, 2009-05-09 at 08:23 -0400, Gabor Grothendieck wrote:
> Try this:
>
> > aggregate(dat["A"], dat["Group"], mean)
> Group A
> 1 1 0.4944810
> 2 2 0.4765412
> 3 3 0.4521068
> 4 4 0.4989000
Thanks Gabor. Ideally, aggregate.default should "work" whatever indexing
one u
Try this:
> aggregate(dat["A"], dat["Group"], mean)
Group A
1 1 0.4944810
2 2 0.4765412
3 3 0.4521068
4 4 0.4989000
On Sat, May 9, 2009 at 8:14 AM, Gavin Simpson wrote:
> Hi,
>
> I find it a bit annoying that aggregate.default forces the returned
> object to loose the '
Hi,
I find it a bit annoying that aggregate.default forces the returned
object to loose the 'name' of the variable aggregated, replacing it with
'x'.
A brief example:
> dat <- data.frame(A = runif(100), B = rnorm(100),
+ Group = gl(4, 25))
> with(dat, aggregate(A, by = list(Gr
