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. 2021 May 26;21(11):3703. doi: 10.3390/s21113703

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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Cumulative distribution function (CDF) of several filters: if $F (x)$ is represented as a CDF, then $F (a)$ is the proportion of points for which the average distance is less than $a$ . The faster the value of cumulative probability increases, the higher the concentration of data. Therefore, it can be used as an indicator to judge the degree of data dispersion.