Variance, Covariance Matrix, Linear Regression, Standard Error, Confidence Interval.
obtain β_cap=[β_1_cap, β_2_cap … β_k_cap]. We won’t actually solve this system of k equations. Instead we’ll directly state the end result, which is the value of β_cap that will minimize the residual sum of squares: The least squares estimator for β (Image by Author) The above elegant, closed-form