Using Nonparametric Procedure to Develop an OCMT Estimator for Big Data Linear Regression Model with Application Chemical Pollution in the Tigris River. Al-Rafidain J Sci [Internet]. 2024 Jan. 14 [cited 2024 Sep. 16];54(1):531-8. Available from: https://jrucs.iq/index.php/JAUCS/article/view/620