Retraction of: Scientific Reports https://doi.org/10.1038/s41598-017-04584-x, published online 23 June 2017
The Editors have retracted this article.
After publication it was brought to the Editors’ attention [1] that it is not correct to compare values of sample entropy that were obtained from time series having vastly different lengths and sampling times, as was done in this study. The increased likelihood for nonstationarity in the longer series as well as different sampling times both significantly affect the probability of the occurrence of patterns in the data, and thus lead to inherently irrelevant comparisons of obtained sample entropy values. This means that the observed differences in sample entropy between the two time series in this study cannot be attributed to actual changes in climatic complexity. The Editors therefore no longer have confidence in the conclusions of this article.
Zhi-Gang Shao disagrees with the retraction.
Reference
Delgado Bonal, A. On the use of complexity algorithms: a cautionary lesson from climate research. Sci Rep 10, 5092, https://doi.org/10.1038/s41598-020-61731-7 (2020).
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Shao, ZG. Retraction Note: Contrasting the complexity of the climate of the past 122,000 years and recent 2000 years. Sci Rep 10, 5366 (2020). https://doi.org/10.1038/s41598-020-61685-w
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DOI: https://doi.org/10.1038/s41598-020-61685-w
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