SUGI 27: SAS(r) Implementation of Nonparametric Smoothing and Lack-of-Fit Based on Smoothers

A user-friendly program in SAS r is proposed to perform many nonparametric smoothing and testing procedures. The nonparametric part of the program consists of resources already available on SAS and the testing part will consist of lack-of-fit tests based on smoothing ideas that will be continuously updated. Four main procedures are described for the testing part of the program: tests of a linear model based on a ratio of quadratic forms and on probability bands, the “order selection” test of fit of a linear model, and a test of fit of a nonlinear regression model. The user-friendly characteristic of this program requires basic knowledge of the SAS System using the SAS Macro language as the base for implementation with modules SAS/STAT r , SAS/IML r , and SAS/GRAPH r .