“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, vol. 17, no. 56, pp. 1097–1111, Mar. 2025, Accessed: Oct. 03, 2026. Available: https://kjeas.uowasit.edu.iq/index.php/kjeas/article/view/1393