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. 2018 Oct 2;10(8):1200–1213. doi: 10.1080/19420862.2018.1512328

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© 2018 The Author(s). Published by Taylor & Francis Group, LLC

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.

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S_{x} = \frac{(1 - \sum I_{N x})}{\sum I_{x}}

(1)