C. Andreas, F. Y. . Harianto, E. J. . Safitri, and N. Chamidah, “Analyzing The Effect of BI 7-Days Repo Rate on The Jakarta Composite Index Using Nonparametric Regression Approaches Based on Least Square Spline Estimator”, JMSK, vol. 17, no. 3, pp. 447-461, May 2021.