"Quantile Regression Varying-Coefficient Model in The Case of Longitudinal Data: A Study on The Success Rates of Secondary Schools in Al-Diwaniyah Governorate \ Iraq", KJEAS, م 17, عدد 56, ص 1097–1111, مارس 2025, تاريخ الوصول: أكتوبر 03, 2026. موجود في: https://kjeas.uowasit.edu.iq/index.php/kjeas/article/view/1393