Research & Statistics
Pearson Correlation Coefficient Calculator
The Pearson correlation coefficient measures the strength and direction of the linear relationship between two variables. It is widely used in physiotherapy research for outcome measure validation and clinical data analysis.
Formula
r = Σ((x-x̄)(y-ȳ)) / √(Σ(x-x̄)² × Σ(y-ȳ)²)
Normal Range
±0.9-1.0: Very strong | ±0.7-0.9: Strong | ±0.5-0.7: Moderate | ±0.3-0.5: Weak
Clinical Use
Outcome measure validation, clinical research, reliability studies, physiotherapy research.
Use the Calculator
Enter patient values and get instant AI-powered clinical interpretation.