[R] by function ??

[Ista Zahn]

Hi,
I think you want

by(TestData[ , "RATIO"], LEAID, median)

-Ista

On Tue, Dec 8, 2009 at 8:36 PM, L.A. <romsa at millect.com> wrote:
>
> I'm just learning and this is probably very simple, but I'm stuck.
>   I'm trying to understand the by().
> This works.
> by(TestData, LEAID, summary)
>
> But, This doesn't.
>
> by(TestData, LEAID, median(RATIO))
>
>
> ERROR: could not find function "FUN"
>
> HELP!
> Thanks,
> LA
> --
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org