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. 2021 Dec 10;11:23775. doi: 10.1038/s41598-021-02622-3

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Graphical representation of the Epidemic Volatility Index (EVI) model. $T$ denotes the end of the time series, $t$ a time point of the time-series. $Se$ and $Sp$ stand for the sensitivity and specificity of the testing procedure calculated at each step of the algorithm. Solid lines are explanatory; at each time point dashed lines represent the iterative optimization process while the bold solid line denotes the end of the algorithm.