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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 [Internet]. 2025 Mar. 12 [cited 2026 Oct. 3];17(56):1097-111. Available from: https://kjeas.uowasit.edu.iq/index.php/kjeas/article/view/1393