Rusmayadi, M., Samsuriadi, Lidaini, L., Isnawan, M. G., Alsulami, N. M., & Purnama, A. (2026). The effect of learning intensity on students’ statistics course scores: A multiple regression approach with Ridge regularization. Polyhedron International Journal in Mathematics Education, 4(1), 75–92. https://doi.org/10.59965/pijme.v4i1.294