2025. Forecasting Stock Prices Using a Nonlinear Approach with the Exponential Smooth Transition Autoregressive (ESTAR) Model. J Statistika: Jurnal Ilmiah Teori dan Aplikasi Statistika. 18, 1 (Jul. 2025), 808–818. DOI:https://doi.org/10.36456/jstat.vol18.no1.a10213.