The coefficient of determination calculator is designed to compute the Rsquared value of a given regression model.
The Rsquared (R^{2}) value is calculated using the following formula:
SSR = Σ(y_{i}  ŷ_{i})^{2}
SST = Σ(y_{i}  ȳ)^{2}
R^{2} =  1  

Where,
SSR = Sum of squared residuals,
SST = Total sum of squares,
y_{i} = Observed value,
ŷ_{i} = Predicted value,
ȳ = Mean (average) of the observed values.