Topic: Polynomial Regression

Worked Example: Comparing Quadratic and Cubic Fits

Worked Example: Fitting and Explaining a Quadratic Curve

Why Centering Preserves Quadratic Fitted Values

Uncertainty in Quadratic Slopes and Turning Points

Turning Points in Quadratic Regression

The Quadratic Regression Model

Testing for Quadratic Curvature

Slopes Along a Quadratic Curve

Scaling Predictors for Stable High-Degree Fits

Quadratic Shapes in Applied Examples