Small D3 apps demonstrating specific topics from the course. Each link opens a standalone demo.
Click to add points and watch the OLS line and residual sum of squares update live.
See the sum of squared residuals as a genuine function of β₀ and β₁ — a rotatable 3D bowl and a matching contour map, with sliders marking exactly where your chosen coefficients sit on it.
1000 simulated samples confirm the theoretical sampling distributions of β̂₀ and β̂₁, and a forest plot of confidence intervals shows coverage matching the nominal confidence level.
Residuals vs. fitted, Normal Q-Q, scale-location, and residuals vs. leverage — all on the same simulated dataset, with draggable points and toggles for heteroscedasticity, nonlinearity, and skew.
Drag to rotate a 3D scatter of two predictors and an outcome, with the OLS-fitted regression plane rendered as a wireframe mesh.
Slide the correlation between two predictors and watch 150 resampled coefficient estimates stretch into an unstable ridge.
Draggable two-class points with a live decision boundary and probability contours, linked to a sigmoid curve panel showing each point's fitted probability.