Coefficient of Determination (R²) Calculator
Calculate the coefficient of determination (R²) to measure how well a regression model fits your data. Includes adjusted R² and visual analysis.
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How to Use the R² Calculator
- Enter paired data values for your independent (X) and dependent (Y) variables
- Select your variables from the dropdown menus
- View the R² and adjusted R² values
- Interpret the strength of the relationship
- Analyze the scatter plot with regression line
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Pearson Correlation Calculator
Calculate Pearson correlation coefficient (r) to measure the strength and direction of linear relationships between two variables. Includes statistical significance testing and R² analysis.
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Calculate covariance to measure how two variables change together. Analyze the direction and magnitude of relationships between paired measurements.