[R] general question about use of list

From: Y G <gatemaze_at_gmail.com>
Date: Mon, 30 Apr 2007 13:15:03 +0100


is this list only related to R issues or it has a broader context regarding questions and discussions about statistics. Is there any other email list or forum for that? For example, I have a question regarding variance. It is defined as:
variance = sum(sq(Xi-mean)) / (N-1)
and I never understood why not define it as variance = sum(absolute(Xi-mean) / (N-1)

I read somewhere that this cannot be differentiated on 0. But, why is it necessary to be able to differentiate it?


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