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. 2018 Aug 31;18(9):2892. doi: 10.3390/s18092892

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Visualizing the variance of data to check the influence of each data augmentation block. (a,b,c) represent the variance of the unaugmented dataset, augmented dataset after the first local averaging and that of the augmented dataset after the first local averaging, shuffling and the second local averaging procedure respectively for the standing activity. (d,e,(f) represent the variance of the unaugmented dataset, augmented dataset after the first local averaging and that of the augmented dataset after the first local averaging, shuffling and the second local averaging procedure respectively for the sitting activity. (g,h,i) represent the variance of the unaugmented dataset, augmented dataset after the first local averaging and that of the augmented dataset after the first local averaging, shuffling and the second local averaging procedure respectively for the walking activity.