Determine the best preliminary method for estimating a non-parametric regression model with a practical application. Journal of the College of Basic Education, [S. l.], v. 22, n. 93, p. 221–244, 2022. DOI: 10.35950/cbej.v22i93.7753. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/7753.. Acesso em: 22 jul. 2024.