Oktarina CR, Nugroho S, Sriliana I. EVALUATION OF THE FLEXIBILITY OF NADARAYA-WATSON KERNEL AND PENALIZED SPLINE ESTIMATORS IN BIVARIATE RESPONSE NONPARAMETRIC REGRESSION MODELS. BAREKENG: J. Math. & App. [Internet]. 8Apr.2026 [cited 9Apr.2026];20(3):2179-94. Available from: https://ojs3.unpatti.ac.id/index.php/barekeng/article/view/21149