Multi-collinearity
Variance Inflation and
Orthogonalization in Regression

               Dr. Chong Ho Yu
               (2022)

• Introduction
• Objectives
• Collinearity and VIF
• Analogy in the variable space
• Analogy in the subject space
• The problem of too many variables
• Mathematical dependence and logical dependence
• Orthogonalization
• Deviation scores
• Polynomial regression
• References