[R] Ranking within a classification variable.

[Liaw, Andy]

> From: Rolf Turner
> 
> In response to my question Andy Liaw wrote:
> 
> > Here's one way:
> 
> 	<snip>
> 
> > > dat$rank <- with(dat, ave(x, f, FUN=rank))
> 
> 	<snip>
> 
> > Don't know how this rates on the slick-quick-sexy scale...
> 
> Thanks Andy.  That's definitely a 10 on the slick-quick-sexy scale.
> I (blush!) didn't know about ``ave()''.

All credits should go to the author of ave().  I didn't know about it either
until I saw it on R-help a while ago.

Cheers,
Andy

 
> 			cheers,
> 
> 				Rolf
> 
> 
>