Siregar, Azhari Umar, Asnarni Lubis, Ayi Darmana, and Retno Dwi Suyanti. “Analysis of Student Cognitive Ability Using The K-Means Cluster and Rasch Model (Winsteps) on Chemical Materials through Zoom Meeting”. Jurnal Komunikasi Pendidikan 6, no. 2 (July 31, 2022): 91–101. Accessed April 27, 2024. https://journal.univetbantara.ac.id/index.php/komdik/article/view/2474.