Expected Shortfall Analysis on Optimal Portfolios Using the Downside Deviation Method: (Case Study: Jakarta Islamic Index (JII) Sharia Stocks for the 2020–2024 Period). mortalita [Internet]. 2026 Jun. 22 [cited 2026 Sep. 27];3(1). Available from: https://www.ejournal.darunnajah.ac.id/index.php/mortalita/article/view/899