“The Use Penalized Quasi Likelihood (PQL) to Estimate Multilevel Binary Logistic Model to Identify the Factors of Anemia”. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 54, no. 1 (January 14, 2024): 498–508. Accessed April 23, 2026. https://jrucs.iq/index.php/JAUCS/article/view/617.