Fajri, Mohammad, Eka Rizky Wulansari, Ayu Anggraeni, and Mufitatul Annisa. 2021. “Spline Nonparametric Regression Model for Local Revenue in Central Sulawesi”. Parameter: Journal of Statistics 1 (2), 31-37. https://doi.org/10.22487/27765660.2021.v1.i2.15427.