There are a number of variants (see comment below) the one presented here is widely used It is therefore important when a statistical model is used either to predict future outcomes or in the testing of hypotheses. In the context of regression it is a statistical measure of how well the regression line approximates the actual data. The coefficient of determination, or $R^2$, is a measure that provides information about the goodness of fit of a model. Contents Toggle Main Menu 1 Definition 2 Interpretation of the $R^2$ value 3 Worked Example 4 Video Examples 5 External Resources 6 See Also Definition
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