Correlation & Regression Simulator

Build scatterplots, explore correlation, investigate least-squares regression, and visualize residuals.

Points:

Correlation coefficient (r):

Least-squares line:

Answer Display

Challenge Mode Target correlation:

Choose a target to begin.

Show / Options Show least-squares line Show mean X & Y lines Show residuals on scatterplot Show residual squares Show residual plot

Instructions:
• Click the scatterplot to add points.
• Drag points to move them.
• Right-click a point to remove it.

Scatter Plot (drag points to move them)

Residual Plot

Residuals are the vertical differences between the observed y-values and the predicted ŷ-values from the least-squares line.