The Accuracy Paradox in AI Equity Markets: A Regime-AwareTrading Strategy using XGBoost and Walk-Forward Optimization. NOLEGEIN-Journal of Financial Planning and Management, [S. l.], v. 9, n. 2, 2026. DOI: 10.37591/njfpm.v9i2.2059. Disponível em: https://mbajournals.in/index.php/JoFPM/article/view/2059. Acesso em: 21 sep. 2026.