Classification of Pneumonia Risk Factor Characteristics in Toddlers Using Classification and Regression Trees (CART) Case Study Regional General Hospital dr. Tengku Mansur Tanjungbalai. Quadratic: J. Inn. Tech. Math. & Math. Educ. [Internet]. 2021 Oct. 29 [cited 2026 Feb. 8];1(2):88-93. Available from: https://ejournal.uin-suka.ac.id/tarbiyah/quadratic/article/view/012-02