RETRACTED: Spearman’s correlation coefficient: The case of duplicate ranks Igor Sazonets, Sergey Yekimov, Jana Hinke, Daniela Šálková and Renáta Křečková E3S Web Conf., 538 (2024) 02031 Published online: 14 June 2024 DOI: 10.1051/e3sconf/202453802031