37600: Coefficient of determination - wikipedia.org

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In many (but not all) instances where R2 is used, the predictors are calculated by ordinary least-squares regression: that is, by minimizing SSerr. In this case R2 increases as we increase the number of variables in the model (R2 is monotone increasing with the number of variables included, i.e. it will never decrease). This illustrates a drawback to one possible use of R2, where one might keep adding variables (Kitchen sink regression) to increase the R2 value.

Coefficient of determination by wikipedia.org
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