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. 2014 Jan 14;16(1):e10. doi: 10.2196/jmir.2875

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©Fabian Sudau, Tim Friede, Jens Grabowski, Janka Koschack, Philip Makedonski, Wolfgang Himmel. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 14.01.2014.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Radar chart showing aggregated domain class use of each cluster (the user vectors belonging to the cluster are summed up). Each cluster vector is a normalized to be a unit vector. The length of a spoke is proportional to the value it represents.