Amelia, Dita, Azizah Atsariyyah Zhafira, Bryan Given Christiano Ginzel, Fery Yulian Putra, and Yoga Setya Wibawa. 2025. “Analyzing the Influence of Gross Domestic Product on the Human Development Index Worldwide in 2021 Using a Nonparametric Regression Approach Based on Penalized Spline Estimator”. (IJCSAM) International Journal of Computing Science and Applied Mathematics 11 (2):68-75. https://doi.org/10.12962/j24775401.ijcsam.v11i2.8851.