[R] Noob question - Identity argument within aggregate function?
knavero at gmail.com
Fri Mar 2 21:51:54 CET 2012
>aggregate(z, identity, mean)
1 2 3 4 5
1.0 3.0 5.0 6.0 7.5
> aggregate(z, mean)
Error: length(time(x)) == length(by[]) is not TRUE
Can someone help me understand the error above and why "identity" is
necessary to satisfy the error
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