Why n − 2 in Regression Variance?
Starting from n − 1 in sample variance, use the intuition of a fitted line chasing the data to see why regression uses n − 2.
Sep 22, 2026
Tutorial 4 · Can Regression Recover the Truth?
Create data with a known linear relationship, add random noise, and see how closely regression recovers the truth—and whether adding a quadratic term really helps.
Sep 13, 2026
Tutorial 4 Extension · What Is Leverage and Why It Matters?
An intuitive introduction to leverage, hat values, and standardized residuals in linear regression.
Sep 12, 2026
ST3131 · Regression Analysis
A systematic introduction to linear regression: estimation, inference, diagnostics, remedies, and a brief look at logistic regression.
Apr 25, 2026