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. 2013 Dec 30;8(12):e83847. doi: 10.1371/journal.pone.0083847

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© 2013 Ros et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Given the prototype clusters , , the solitary cluster and the carefully selected subset of representatives , the closest cluster to is since . The representatives with the shortest distance are denoted as and . is then (re-) assigned to the closest cluster only if the distance is smaller than , whilst is the standard deviation of the distances between all representatives in .

Inline graphic — Given the prototype clusters , , the solitary cluster and the carefully selected subset of representatives , the closest cluster to is since . The representatives with the shortest distance are denoted as and . is then (re-) assigned to the closest cluster only if the distance is smaller than , whilst is the standard deviation of the distances between all representatives in .