Siregar, Azhari Umar, Asnarni Lubis, Ayi Darmana, and Retno Dwi Suyanti. 2022. “Analysis of Student Cognitive Ability Using The K-Means Cluster and Rasch Model (Winsteps) on Chemical Materials through Zoom Meeting”. Jurnal Komunikasi Pendidikan 6 (2):91-101. https://doi.org/10.32585/jkp.v6i2.2474.