Melin Wanike Ketrin et al. 2023. Nonparametric Regression Modeling with Fourier Series Approach on Poverty Cases in West Sumatra Province. UNP Journal of Statistics and Data Science. 1, 2 (Mar. 2023), 53–58. DOI:https://doi.org/10.24036/ujsds/vol1-iss2/32.