If the Pearson’s correlation coefficient (r) is 0.9, what is the value of coefficient of determination?
[Question ID = 1426]
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$R^2$ always ranges from $0$ to $1$ (or $0\%$ to $100\%$). Unlike $r$, which can be negative, $R^2$ is always non-negative. It tells you how well the "regression line" fits the data.