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. 2021 Jun 23;23(7):793. doi: 10.3390/e23070793

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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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Histograms characterizing the FIFA 2021 dataset according to the attributes: (a) age; (b) $ln (value_eur)$ ; (c) $ln (wage_eur)$ ; (d) $ln (release_clause_eur)$ .