What is Regression Calculator and Why it Matters?
Linear regression estimates the best-fitting line and quantifies fit quality via R², the starting point of statistical modeling.
Mathematical Formula and Theory
b = Σ(xᵢ−x̄)(yᵢ−ȳ)/Σ(xᵢ−x̄)², a = ȳ−b x̄. R² = 1 − SS_res/SS_tot.
How to Use This Calculator - Step by Step
- Enter x y pairs, one per line.
- Click Fit Line.
Solved Example with Full Calculation
Points (1,2.1)…(5,10.1) yield y≈0.02+2.00x with R²≈0.997.