Estimating Restricted Gamma Regression Model by Combining Gamma Ridge Regression and Restricted Maximum Likelihood with Presence of the Multicollinearity Problem with Application. Al-Rafidain J Sci [Internet]. 2025 Jan. 5 [cited 2026 Apr. 24];56(1):265-73. Available from: https://jrucs.iq/index.php/JAUCS/article/view/700