[R] Noob question - Identity argument within aggregate function?

knavero knavero at gmail.com
Sat Mar 3 02:30:20 CET 2012


I've also searched "?identity" in the R shell and it doesn't seem to be the
definition I'm looking for for this particular usage of "identity" as an
argument in the aggregate function. I simply would appreciate a conceptual
explanation of what it does here and how it relates to the error.

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