“Using Nonparametric Procedure to Develop an OCMT Estimator for Big Data Linear Regression Model With Application Chemical Pollution in the Tigris River”. 2024. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ) 54 (1): 531-38. https://doi.org/10.55562/jrucs.v54i1.620.