Andrea Tri Rian Dani; Fachrian Bimantoro Putra; Meirinda Fauziyah; Ratna Kusuma; Darnah; Hadi Koirudin; Chiko Zet Oroh; Raditya Arya Kosasih. Interval Estimation in Truncated Spline Regression: Analyzing the 2023 Indonesian Democracy Index. Sci Tech Asia 2025, 30, 112-125.