Re: [R] general question about use of list

From: Leeds, Mark (IED) <Mark.Leeds_at_morganstanley.com>
Date: Mon, 30 Apr 2007 09:52:31 -0400

it's also not unbiased.

-----Original Message-----
From: r-help-bounces_at_stat.math.ethz.ch
[mailto:r-help-bounces_at_stat.math.ethz.ch] On Behalf Of Y G Sent: Monday, April 30, 2007 8:15 AM
To: r-help_at_stat.math.ethz.ch
Subject: [R] general question about use of list

Hi,

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?

Thanks.

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon 30 Apr 2007 - 16:54:29 GMT

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