[R] by function ??

L.A. romsa at millect.com
Wed Dec 9 02:36:14 CET 2009

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"

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