A comparison between the hierarchical clustering methods for postgraduate students in Iraqi universities for the year 2019-2020 using the cophenetic and delta correlation coefficients. Periodicals of Engineering and Natural Sciences, [S. l.], v. 11, n. 1, p. 174–185, 2025. DOI: 10.21533/pen.v11.i1.87. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/87. Acesso em: 26 mar. 2026.