Code for Nonlinear and Multiple Regression

• ex13_01.R (aptness of the model and model checking)
  
• ex13_02.R (regression with transformed variables)
  
• ex13_03.R (polynomial regression)
  
• ex13_04.R (multiple regression analysis)
  
• ex13_05.R (other issues in multiple regression)
  
• ex13_supplementary_exercises.R (supplementary exercises)
  
• H0_linear_model.R (tests whether a nonlinear model is needed to fit the data)