İşleyen, Şakir, Zebari, A. and Jameel, H. 2026. An Analysis of the COVID-19 Agenda Using Big Data from Social Media: A Comparative Study across Countries with R Programming. Jurnal Diferensial. 8, 1 (Mar. 2026), 20-32. DOI:https://doi.org/10.35508/jd.v8i1.26853.