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2024. Using Nonparametric Procedure to Develop an OCMT Estimator for Big Data Linear Regression Model with Application Chemical Pollution in the Tigris River. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 54, 1 (Jan. 2024), 531–538. DOI:https://doi.org/10.55562/jrucs.v54i1.620.