The coefficient of determination or R-squared. How do we know how accurate our equation is?The coefficient of determination or R-squared: Ratio of the explained sum of squares to the total sum of squares. R-squared = Explained Sum of Squares / Total Sum of SquaresR2 = ESS/TSS = R2 = 1 - RSS/TS

Total, Explained, and Residual Sum of Squares

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