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
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 objects in the list passed to the 'by'
object.
ex. it is annoying to type
with(
my.data
,aggregate(
