Purnama DI. A Comparison between Nonparametric Approach: Smoothing Spline and B-Spline to Analyze The Total of Train Passengers in Sumatra Island. EKSAKTA: J. Sci. Data Anal. [Internet]. 2020 Mar. 30 [cited 2024 May 3];20(1):73-80. Available from: https://journal.uii.ac.id/Eksakta/article/view/12794