Estimate Local Polynomial Regression In R. Https Encrypted Tbn0 Gstatic Com Images Q Tbn And9gcslz0jwqf7re2z638 5muh3yrrumbar2j9praxm8o3z2mkdk3nw9fifh09s3oc 6de6q8i6qwv25qexpuggpg Usqp Cau Ec 45799664 from encrypted-tbn0.gstatic.com