“Using Dummy Variables in Improving the Simple Linear Regression Model for the Ratio of Consumption to the National Income in Iraq during the Period (1970-1994)”, ANJS, vol. 15, no. 3, pp. 167–172, Sep. 2012, Accessed: Apr. 22, 2025. [Online]. Available: https://anjs.edu.iq/index.php/anjs/article/view/842