On Tue, 2005-03-01 at 01:21 +0000, Gabor Grothendieck wrote:
<snip>
> Here is a slight variation of Marc's solution that avoids explicit
> setting of the row names:
>
> R> my.tmp <- split(warpbreaks$breaks,
> + list(warpbreaks$wool, warpbreaks$tension))
> R> my.tmp <- lapply(my.tmp, quantile)
> R> do.call("rbind", my.tmp)
> 0% 25% 50% 75% 100%
> A.L 25 26 51 54 70
> B.L 14 20 29 31 44
> A.M 12 18 21 30 36
> B.M 16 21 28 39 42
> A.H 10 18 24 28 43
> B.H 13 15 17 21 28
Gabor,
I had my head wrapped around trying to figure out a solution in a post
hoc fashion. Didn't even think of splitting the data first.
Better solution.
Thanks,
Marc
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