When the estimated regression line is obtained via the principle of least squares, the sum of the residuals $y _ { i } - \hat { y } _ { i }$ (i = 1, 3, …….., n) should in theory be __________.

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The Answer of When the estimated regression line is obtained via the principle of least squares, the sum of the residuals $y _ { i } - \hat { y } _ { i }$ (i = 1, 3, …….., n) should in theory be __________.

When the Estimated Regression Line Is Obtained Via the Principle yi−y^iy _ { i } - \hat { y } _ { i }yi​−y^​i​

When the Estimated Regression Line Is Obtained Via the Principle $y _ { i } - \hat { y } _ { i }$