On Thursday 27 September 2007 (17:57:55), Mike Lawrence wrote:
> ex. it is annoying to type
>
> with(
> my.data
> ,aggregate(
> my.dv
> ,list(
> one.iv = one.iv
> ,another.iv = another.iv
>
You seem to be assuming that the argument 'by' to the "data frame" method
of aggregate() is a call to list() with arguments which are names (and
evaluate to factors).
When aggregate.data.frame comes to be called, the 'by' argument is a
promise to the actual argument. In your example the actual
You can do this too:
aggregate(iris[-5], iris["Species"], mean)
or this:
with(iris, aggregate(iris[-5], data.frame(Species), mean))
or this:
attach(iris)
aggregate(iris[-5], data.frame(Species), mean)
The point is that you already don't have to write x = x. The only
reason you are writing it
Understood, but my point is that the naming I suggest should be the
default. One should not be 'punished' for being explicit in calling
aggregate.
On 27-Sep-07, at 1:06 PM, Gabor Grothendieck wrote:
> You can do this:
>
> aggregate(iris[-5], iris[5], mean)
>
>
> On 9/27/07, Mike Lawrence <[E
You can do this:
aggregate(iris[-5], iris[5], mean)
On 9/27/07, Mike Lawrence <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> A suggestion derived from discussions amongst a number of R users in
> my research group: set the default column names produced by aggregate
> () equal to the names of the objec
