2021. Estimate the General Trend using Semi parametric Regression Models with a Forecast Value of GDP in Iraq. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 35, 1 (Oct. 2021), 26–44. DOI:https://doi.org/10.55562/jrucs.v35i1.263.