Standard deviation is no longer NaN when we see a single case with weight > 1.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11424 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Standard deviation is no longer NaN when we see a single case with weight > 1.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11425 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Thanks to Benjamin Weber, we now have a numerically stable implementation of variance calculation in Instances, Utils, and Stats, in addition to an extensive testing framework.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11426 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Standard deviation is no longer NaN when we see a single case with weight > 1.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11427 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Updated reference file after changes to Stats

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11428 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Updated reference file after changes to Stats

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11429 e0a1b77d-ad91-4216-81b1-defd5f83fa92