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Linear Modelingmedium
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In a multiple linear regression analysis, suppose the second predictor variable x2x_2x2​ is perfectly collinear with the first predictor variable x1x_1x1​ (specifically, x2=2x1+5x_2 = 2x_1 + 5x2​=2x1​+5 for all observations). What happens when you attempt to estimate the regression coefficients using ordinary least squares (OLS)?