Zahid Khan, Amina Shahzadi, Ammara Nawaz Cheema, Bashir ul Haq, Maria Malik. An Efficient Modified Ratio Estimator under Stratified Ranked Set Sampling . Metall Mater Eng [Internet]. 2024 Dec. 14 [cited 2026 Aug. 30];30(4):677-86. Available from: https://www.metall-mater-eng.com/index.php/home/article/view/1497