[R] factors ordered by mean
hadley wickham
h.wickham at gmail.com
Thu Feb 21 03:24:16 CET 2008
On Wed, Feb 20, 2008 at 6:02 PM, Ronaldo Reis Junior <chrysopa at gmail.com> wrote:
> Hi,
>
> How to order the levels os factor not by alphabetic order but by mean of Y.
> Somethink like this:
>
> I have this alphabetic order:
>
> > levels(pH)
> [1] "alto" "baixo" "medio"
>
> the order by mean os yvar is:
> > sort(tapply(Riqueza,pH,mean))
> baixo medio alto
> 11.56667 20.00000 26.80000
>
> How to make the levels of pH ordered by this mean to the result to see
> somethink like this:
>
> > levels(pH)
> [1] "baixo" "medio" "alto"
Have a look at ?reorder
Hadley
--
http://had.co.nz/
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