[R] mean vs sum behavior

From: Emmanuel Castella <Emmanuel.Castella_at_leba.unige.ch>
Date: Mon, 31 Mar 2008 18:41:51 +0200

Dear all
Could someone explain me why
returns means per levels of fac for each column of x whereas
does not return sums per level of fac and columns of x, but adds all columns together?
Hence, how can I get sum to behave as mean in this instance? Thank you very much in advance
E. Castella

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