List of Articles Collective Learning Open Access Article Abstract Page Full-Text 1 - Stock portfolio optimization based on the combined model of omega ratio and mean-variance Markowitz based on two-level ensemble machine learning sanaz faridi Mahdi Madanchi Zaj amir daneshvar shadi shahverdiani fereydoon rahnama 10.30495/jfksa.2022.21083 Open Access Article Abstract Page Full-Text 2 - Presenting financial bankruptcy risk prediction model of stock and transborder companies using machine learning algorithms Mohsen Aali Seyed Alireza Mirarab Baygi Nima Farajian