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. 2016 Jun 8;13:52. doi: 10.1186/s12984-016-0163-4

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Graphic representation of factor analysis results. All indices except meanVel/maxVel resulted in being grouped together within a specific factor. Factor 1 deals with accuracy of movement trajectory, Factor 2 deals with trajectory smoothness and Factor 3 deals with velocity