NORMA, Norma; SURWANTI, Arni; RAHMAWATI, Alni. The Analysis of Optimal Portfolio on Investment Decision Using Single Index Model on LQ45 Stocks (Listed on Indonesia Stock Exchange for The Period 2022-2024). Journal of Economics and Management Scienties, [S. l.], v. 7, n. 4, p. 670–677, 2025. DOI: 10.37034/jems.v7i4.204. Disponível em: https://jems.ink/index.php/JEMS/article/view/204. Acesso em: 13 may. 2026.