Linear Regression Calculator
Enter x and y values (comma-separated) with equal counts. At least 2 pairs required.
Linear Regression — Formula
Regression line y = bx + a
b = Σ(x−x̄)(y−ȳ) / Σ(x−x̄)² (slope)
a = ȳ − b×x̄ (intercept)
R² (coefficient of determination)
R² = 1 − SSᵣᵉᵗ / SSᵗᵒᵗ — ranges 0–1. Closer to 1 = better fit.
