The coefficient of determination: is it the R-squared or r-squared?

We often use the coefficient of determination as a swift ‘measure’ of goodness of fit for our regression models. Unfortunately, there is no unique symbol for such a coefficient and both \(R^2\) and \(r^2\) are used in literature, almost interchangea... Continue reading: The coefficient of determination: is it the R-squared or r-squared?
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