Investopedia explains 'Residual Sum Of Squares - RSS'
It is not possible to draw conclusions about the correctness of the regression function solely using the residual sum of squares. Since a sufficiently complex regression function can be made to closely fit virtually any data set, further study is necessary to determine whether the regression function is in fact useful in explaining the variance of the data set. Typically, however, a smaller residual sum of squares is ideal
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