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. 2018 Oct 26;8:15901. doi: 10.1038/s41598-018-33165-9

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Residual diagnostic plots of ETS (A,N,A) model. (a) Standardized residuals. (b) Autocorrelation function (ACF) plot of the time-series residuals. (c) Normal Q-Q plot for determining the normality of the time-series residuals. (d) P values for Ljung-Box statistic. On the basis of the graphs, it seems that existing occult information are still required to explore.