رشيدظافر, and حمودمناف. “Nadaraya-Watson Estimator a Smoothing Technique for Estimating Regression Function”. Journal of Economics and Administrative Sciences 18, no. 65 (March 1, 2012): 283. Accessed August 19, 2021. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/1112.