Juliah Ratnaningsih D, Saefuddin A, Kurnia A. Stratified-Extended Cox with Frailty Model for Non-Proportional Hazard: A Statistical Approach to Student Retention Data from Universitas Terbuka in Indonesia. Thail. Stat. [Internet]. 2020 Dec. 28 [cited 2024 May 4];19(1):208-27. Available from: https://ph02.tci-thaijo.org/index.php/thaistat/article/view/242826