Variation in Educational Attainment Levels: Statistical Evidence from The Nigeria Demographic Health Surveys (2008, 2013 and 2018). International Journal of Development Mathematics (IJDM), [S. l.], v. 1, n. 2, p. 191–199, 2024. DOI: 10.62054/ijdm/0102.15. Disponível em: https://ijdm.org.ng/index.php/Journals/article/view/64.. Acesso em: 28 aug. 2026.