Figure 1: Overfitting is a challenge for regression and classification ... For example, a straight line underfits a third-order polynomial underlying a model with normally distributed noise ...

One problem involves finding linear and nonlinear regression ... of-variance model. The following statements provide a specific example of using the TRANSREG procedure for fitting nonlinear regression ...

Topics include simple and multiple regression; linear models with categorical explanatory variables; model diagnostics; inference for linear models; polynomial regression; models for time dependence; ...