[R] means, SD's and tapply

zem zmanolova at gmail.com
Fri Feb 25 22:06:22 CET 2011


Hi Christopher,

i think you have the same problem like me today :) 
see this  
http://r.789695.n4.nabble.com/group-by-in-data-frame-tc3324240.html post 
i think you can find there the solution

zem
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