Ordinary Least Squares (OLS) minimizes the residual sum of squares (RSS). RSS is the sum of each squared residual (residual = the observed Y minus the predicted “on the line” Y).

Also, about the OLS: the average residual is always zero, and the line passes through the point (average X, average Y).

This video by Bionic Turtle explains this method of ordinary least squares (OLS).

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