Poverty Modeling in East Nusa Tenggara Using Fourier Nonparametric Regression with Cosine–Sine Comparison and Hypothesis Testing. ujsds [Internet]. 31 Mei 2026 [dikutip 3 Oktober 2026];4(2):252-64. Tersedia pada: https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/493