2021. Comparison of Some Estimation Methods for the Multiple Linear Regression Model with Existence of Both Auto - Correlation and Multicollinearity Problems. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 46, 1 (Oct. 2021), 132–156. DOI:https://doi.org/10.55562/jrucs.v46i1.73.