Chen, Chia-Cheng, Chun-Hung Chen, and Ting-Yin Liu. “Investment Performance of Machine Learning: Analysis of S&P 500 Index”. International Journal of Economics and Financial Issues 10, no. 1 (December 17, 2019): 59–66. Accessed November 14, 2024. https://econjournals.com./index.php/ijefi/article/view/8925.