Correlation Coefficient Calculator
Calculate the Pearson correlation coefficient (r) to measure linear relationship between two variables.
Correlation (r)
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r² (Coefficient)
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Relationship
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Pearson Correlation Coefficient
r = Σ[(xᵢ − x̄)(yᵢ − ȳ)] / √[Σ(xᵢ − x̄)² × Σ(yᵢ − ȳ)²]
Interpreting r Values
- r = 1: Perfect positive correlation
- r = −1: Perfect negative correlation
- r = 0: No linear correlation
- |r| > 0.7: Strong correlation
- 0.3 < |r| < 0.7: Moderate correlation
- |r| < 0.3: Weak correlation