“Comparison Between the Two Methods of Ridge Regression and Principal Components Regression Using the Monte Carlo Simulation by MSE”. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 46, no. 1 (October 1, 2021): 338–360. Accessed October 28, 2025. https://jrucs.iq/index.php/JAUCS/article/view/86.